diff --git a/src/sdsalloc.h b/src/sdsalloc.h
index 531d41929..c04ff2a0a 100644
--- a/src/sdsalloc.h
+++ b/src/sdsalloc.h
@@ -36,7 +36,12 @@
  * the include of your alternate allocator if needed (not needed in order
  * to use the default libc allocator). */
 
+#ifndef __SDS_ALLOC_H__
+#define __SDS_ALLOC_H__
+
 #include "zmalloc.h"
 #define s_malloc zmalloc
 #define s_realloc zrealloc
 #define s_free zfree
+
+#endif