diff --git a/src/interfaces/ecpg/test/compat_informix/rfmtdate.pgc b/src/interfaces/ecpg/test/compat_informix/rfmtdate.pgc
index 287acc3d5086cafd8ad685cd2c65aeb65205d8fa..c799de67624fcd15532e272bd36fa9a8eebae229 100644
--- a/src/interfaces/ecpg/test/compat_informix/rfmtdate.pgc
+++ b/src/interfaces/ecpg/test/compat_informix/rfmtdate.pgc
@@ -151,7 +151,7 @@ main(void)
 }
 
 static void
-check_return(ret)
+check_return(int ret)
 {
 	switch(ret)
 	{
diff --git a/src/interfaces/ecpg/test/compat_informix/rfmtlong.pgc b/src/interfaces/ecpg/test/compat_informix/rfmtlong.pgc
index 19f220ffcee2ab63f7fed04c091fd0a072ddab6e..162b42505f8c81752a1a9f46610553d16ae212e0 100644
--- a/src/interfaces/ecpg/test/compat_informix/rfmtlong.pgc
+++ b/src/interfaces/ecpg/test/compat_informix/rfmtlong.pgc
@@ -49,7 +49,7 @@ main(void)
 }
 
 static void
-check_return(ret)
+check_return(int ret)
 {
 	switch(ret)
 	{