diff --git a/src/eap_peer/eap.c b/src/eap_peer/eap.c
index 52e9e312d..6e356c0df 100644
--- a/src/eap_peer/eap.c
+++ b/src/eap_peer/eap.c
@@ -474,7 +474,7 @@ static void eap_peer_erp_init(struct eap_sm *sm)
 {
 #ifdef CONFIG_ERP
 	u8 *emsk = NULL;
-	size_t emsk_len;
+	size_t emsk_len = 0;
 	u8 EMSKname[EAP_EMSK_NAME_LEN];
 	u8 len[2];
 	char *realm;
diff --git a/src/eap_server/eap_server.c b/src/eap_server/eap_server.c
index 53e32c381..bd919e570 100644
--- a/src/eap_server/eap_server.c
+++ b/src/eap_server/eap_server.c
@@ -412,7 +412,7 @@ static void eap_server_erp_init(struct eap_sm *sm)
 {
 #ifdef CONFIG_ERP
 	u8 *emsk = NULL;
-	size_t emsk_len;
+	size_t emsk_len = 0;
 	u8 EMSKname[EAP_EMSK_NAME_LEN];
 	u8 len[2];
 	const char *domain;