diff --git a/src/interfaces/ecpg/test/compat_informix/rfmtdate.pgc b/src/interfaces/ecpg/test/compat_informix/rfmtdate.pgc
index 287acc3d50..c799de6762 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 19f220ffce..162b42505f 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)
 	{