diff --git a/lib/pfcp/context.c b/lib/pfcp/context.c
index 3a44ff35a..cdd0d3511 100644
--- a/lib/pfcp/context.c
+++ b/lib/pfcp/context.c
@@ -748,6 +748,9 @@ int ogs_pfcp_context_parse_config(const char *local, const char *remote)
                         const char *high[OGS_MAX_NUM_OF_SUBNET_RANGE];
                         int i, num = 0;
 
+                        memset(low, 0, sizeof(low));
+                        memset(high, 0, sizeof(high));
+
                         if (ogs_yaml_iter_type(&subnet_array) ==
                                 YAML_MAPPING_NODE) {
                             memcpy(&subnet_iter, &subnet_array,