diff --git a/skeletons/tests/check-GeneralizedTime.c b/skeletons/tests/check-GeneralizedTime.c
index 245e940..9eabb69 100644
--- a/skeletons/tests/check-GeneralizedTime.c
+++ b/skeletons/tests/check-GeneralizedTime.c
@@ -267,6 +267,7 @@
 	(void)cb;
 	(void)app_key;
 
+	memset(&erval, 0, sizeof(erval));
 	return erval;
 }
 
@@ -281,5 +282,6 @@
 	(void)cb;
 	(void)app_key;
 
+	memset(&erval, 0, sizeof(erval));
 	return erval;
 }
diff --git a/skeletons/tests/check-UTCTime.c b/skeletons/tests/check-UTCTime.c
index 96803ad..81dde56 100644
--- a/skeletons/tests/check-UTCTime.c
+++ b/skeletons/tests/check-UTCTime.c
@@ -74,6 +74,7 @@
 	(void)cb;
 	(void)app_key;
 
+	memset(&erval, 0, sizeof(erval));
 	return erval;
 }
 
@@ -88,5 +89,6 @@
 	(void)cb;
 	(void)app_key;
 
+	memset(&erval, 0, sizeof(erval));
 	return erval;
 }