diff --git a/include/FLAC/assert.h b/include/FLAC/assert.h
index 2a3f671b..422b85b2 100644
--- a/include/FLAC/assert.h
+++ b/include/FLAC/assert.h
@@ -24,8 +24,10 @@
 #ifdef DEBUG
 #include <assert.h>
 #define FLAC__ASSERT(x) assert(x)
+#define FLAC__ASSERT_DECLARATION(x) x
 #else
 #define FLAC__ASSERT(x)
+#define FLAC__ASSERT_DECLARATION(x)
 #endif
 
 #endif