diff --git a/hypopg.c b/hypopg.c
index 3f15502..e0f3575 100644
--- a/hypopg.c
+++ b/hypopg.c
@@ -125,6 +125,7 @@ _PG_init(void)
 							 NULL,
 							 NULL);
 
+	EmitWarningsOnPlaceholders("hypopg");
 }
 
 void