diff --git a/include/rapidjson/reader.h b/include/rapidjson/reader.h
index 00ab6a5..ccc025e 100644
--- a/include/rapidjson/reader.h
+++ b/include/rapidjson/reader.h
@@ -955,7 +955,7 @@ private:
                 if (c == '\0')
                     RAPIDJSON_PARSE_ERROR(kParseErrorStringMissQuotationMark, is.Tell());
                 else
-                    RAPIDJSON_PARSE_ERROR(kParseErrorStringEscapeInvalid, is.Tell());
+                    RAPIDJSON_PARSE_ERROR(kParseErrorStringInvalidEncoding, is.Tell());
             }
             else {
                 size_t offset = is.Tell();
@@ -990,7 +990,7 @@ private:
         // The rest of string using SIMD
         static const char dquote[16] = { '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"' };
         static const char bslash[16] = { '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\' };
-        static const char space[16]  = { 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19 };
+        static const char space[16]  = { 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F };
         const __m128i dq = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&dquote[0]));
         const __m128i bs = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&bslash[0]));
         const __m128i sp = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&space[0]));
@@ -999,7 +999,7 @@ private:
             const __m128i s = _mm_load_si128(reinterpret_cast<const __m128i *>(p));
             const __m128i t1 = _mm_cmpeq_epi8(s, dq);
             const __m128i t2 = _mm_cmpeq_epi8(s, bs);
-            const __m128i t3 = _mm_cmpeq_epi8(_mm_max_epu8(s, sp), sp); // s < 0x20 <=> max(s, 0x19) == 0x19
+            const __m128i t3 = _mm_cmpeq_epi8(_mm_max_epu8(s, sp), sp); // s < 0x20 <=> max(s, 0x1F) == 0x1F
             const __m128i x = _mm_or_si128(_mm_or_si128(t1, t2), t3);
             unsigned short r = static_cast<unsigned short>(_mm_movemask_epi8(x));
             if (RAPIDJSON_UNLIKELY(r != 0)) {   // some of characters is escaped
@@ -1053,7 +1053,7 @@ private:
         // The rest of string using SIMD
         static const char dquote[16] = { '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"' };
         static const char bslash[16] = { '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\' };
-        static const char space[16] = { 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19 };
+        static const char space[16] = { 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F };
         const __m128i dq = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&dquote[0]));
         const __m128i bs = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&bslash[0]));
         const __m128i sp = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&space[0]));
@@ -1062,7 +1062,7 @@ private:
             const __m128i s = _mm_load_si128(reinterpret_cast<const __m128i *>(p));
             const __m128i t1 = _mm_cmpeq_epi8(s, dq);
             const __m128i t2 = _mm_cmpeq_epi8(s, bs);
-            const __m128i t3 = _mm_cmpeq_epi8(_mm_max_epu8(s, sp), sp); // s < 0x20 <=> max(s, 0x19) == 0x19
+            const __m128i t3 = _mm_cmpeq_epi8(_mm_max_epu8(s, sp), sp); // s < 0x20 <=> max(s, 0x1F) == 0x1F
             const __m128i x = _mm_or_si128(_mm_or_si128(t1, t2), t3);
             unsigned short r = static_cast<unsigned short>(_mm_movemask_epi8(x));
             if (RAPIDJSON_UNLIKELY(r != 0)) {   // some of characters is escaped
@@ -1101,7 +1101,7 @@ private:
         // The rest of string using SIMD
         static const char dquote[16] = { '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"' };
         static const char bslash[16] = { '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\' };
-        static const char space[16] = { 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19 };
+        static const char space[16] = { 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F };
         const __m128i dq = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&dquote[0]));
         const __m128i bs = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&bslash[0]));
         const __m128i sp = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&space[0]));
@@ -1110,7 +1110,7 @@ private:
             const __m128i s = _mm_load_si128(reinterpret_cast<const __m128i *>(p));
             const __m128i t1 = _mm_cmpeq_epi8(s, dq);
             const __m128i t2 = _mm_cmpeq_epi8(s, bs);
-            const __m128i t3 = _mm_cmpeq_epi8(_mm_max_epu8(s, sp), sp); // s < 0x20 <=> max(s, 0x19) == 0x19
+            const __m128i t3 = _mm_cmpeq_epi8(_mm_max_epu8(s, sp), sp); // s < 0x20 <=> max(s, 0x1F) == 0x1F
             const __m128i x = _mm_or_si128(_mm_or_si128(t1, t2), t3);
             unsigned short r = static_cast<unsigned short>(_mm_movemask_epi8(x));
             if (RAPIDJSON_UNLIKELY(r != 0)) {   // some of characters is escaped
diff --git a/include/rapidjson/writer.h b/include/rapidjson/writer.h
index cb7afd5..219da5e 100644
--- a/include/rapidjson/writer.h
+++ b/include/rapidjson/writer.h
@@ -585,7 +585,7 @@ inline bool Writer<StringBuffer>::ScanWriteUnescapedString(StringStream& is, siz
     // The rest of string using SIMD
     static const char dquote[16] = { '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"', '\"' };
     static const char bslash[16] = { '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\' };
-    static const char space[16]  = { 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19 };
+    static const char space[16]  = { 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F };
     const __m128i dq = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&dquote[0]));
     const __m128i bs = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&bslash[0]));
     const __m128i sp = _mm_loadu_si128(reinterpret_cast<const __m128i *>(&space[0]));
@@ -594,7 +594,7 @@ inline bool Writer<StringBuffer>::ScanWriteUnescapedString(StringStream& is, siz
         const __m128i s = _mm_load_si128(reinterpret_cast<const __m128i *>(p));
         const __m128i t1 = _mm_cmpeq_epi8(s, dq);
         const __m128i t2 = _mm_cmpeq_epi8(s, bs);
-        const __m128i t3 = _mm_cmpeq_epi8(_mm_max_epu8(s, sp), sp); // s < 0x20 <=> max(s, 0x19) == 0x19
+        const __m128i t3 = _mm_cmpeq_epi8(_mm_max_epu8(s, sp), sp); // s < 0x20 <=> max(s, 0x1F) == 0x1F
         const __m128i x = _mm_or_si128(_mm_or_si128(t1, t2), t3);
         unsigned short r = static_cast<unsigned short>(_mm_movemask_epi8(x));
         if (RAPIDJSON_UNLIKELY(r != 0)) {   // some of characters is escaped
diff --git a/test/unittest/readertest.cpp b/test/unittest/readertest.cpp
index 3555f11..5078f52 100644
--- a/test/unittest/readertest.cpp
+++ b/test/unittest/readertest.cpp
@@ -725,6 +725,8 @@ TEST(Reader, ParseString_Error) {
 
     // Malform ASCII sequence
     TEST_STRINGENCODING_ERROR(ASCII<>, UTF8<>, char, ARRAY('[', '\"', char(0x80u), '\"', ']', '\0'));
+    TEST_STRINGENCODING_ERROR(ASCII<>, UTF8<>, char, ARRAY('[', '\"', char(0x01u), '\"', ']', '\0'));
+    TEST_STRINGENCODING_ERROR(ASCII<>, UTF8<>, char, ARRAY('[', '\"', char(0x1Cu), '\"', ']', '\0'));
 
 #undef ARRAY
 #undef TEST_STRINGARRAY_ERROR
diff --git a/test/unittest/writertest.cpp b/test/unittest/writertest.cpp
index e630bb9..b190c6c 100644
--- a/test/unittest/writertest.cpp
+++ b/test/unittest/writertest.cpp
@@ -412,8 +412,10 @@ TEST(Writer, ValidateEncoding) {
         EXPECT_TRUE(writer.String("\xC2\xA2"));         // Cents sign U+00A2
         EXPECT_TRUE(writer.String("\xE2\x82\xAC"));     // Euro sign U+20AC
         EXPECT_TRUE(writer.String("\xF0\x9D\x84\x9E")); // G clef sign U+1D11E
+        EXPECT_TRUE(writer.String("\x01"));             // SOH control U+0001
+        EXPECT_TRUE(writer.String("\x1B"));             // Escape control U+001B
         writer.EndArray();
-        EXPECT_STREQ("[\"\x24\",\"\xC2\xA2\",\"\xE2\x82\xAC\",\"\xF0\x9D\x84\x9E\"]", buffer.GetString());
+        EXPECT_STREQ("[\"\x24\",\"\xC2\xA2\",\"\xE2\x82\xAC\",\"\xF0\x9D\x84\x9E\",\"\\u0001\",\"\\u001B\"]", buffer.GetString());
     }
 
     // Fail in decoding invalid UTF-8 sequence http://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-test.txt