diff --git a/girepository/gitypelib-internal.h b/girepository/gitypelib-internal.h
index d66e2f068..cb5610ef6 100644
--- a/girepository/gitypelib-internal.h
+++ b/girepository/gitypelib-internal.h
@@ -198,7 +198,7 @@ typedef enum {
 #if defined (G_CAN_INLINE) && defined (G_ALWAYS_INLINE)
 
 G_ALWAYS_INLINE
-inline gboolean
+static inline gboolean
 _blob_is_registered_type (GITypelibBlobType blob_type)
 {
   switch (blob_type)