diff --git a/src/sds.h b/src/sds.h
index 1985fb263..4ae1e4dfd 100644
--- a/src/sds.h
+++ b/src/sds.h
@@ -98,7 +98,7 @@ struct __attribute__ ((__packed__)) sdshdr64 {
 #define SDS_HDR(T,s) ((struct sdshdr##T *)((s)-(sizeof(struct sdshdr##T))))
 #define SDS_TYPE_5_LEN(f) ((f)>>SDS_TYPE_BITS)
 
-inline size_t sdslen(const sds s) {
+static inline size_t sdslen(const sds s) {
     unsigned char flags = s[-1];
     int type = flags & SDS_TYPE_MASK;