diff --git a/src/pcm/mask_inline.h b/src/pcm/mask_inline.h
index e9fb9f81..75ad3594 100644
--- a/src/pcm/mask_inline.h
+++ b/src/pcm/mask_inline.h
@@ -19,6 +19,7 @@
  *
  */
   
+#include <strings.h>
 #include <sys/types.h>
 
 #define MASK_INLINE static inline