diff --git a/src/core/ngx_crc32.h b/src/core/ngx_crc32.h
index fe76156..4435e45 100644
--- a/src/core/ngx_crc32.h
+++ b/src/core/ngx_crc32.h
@@ -53,7 +53,7 @@
     crc = 0xffffffff
 
 
-static void
+static ngx_inline void
 ngx_crc32_update(uint32_t *crc, u_char *p, size_t len)
 {
     uint32_t  c;