diff --git a/libfreerdp/core/gateway/arm.c b/libfreerdp/core/gateway/arm.c
index 2ec8d3e7b..d506c7595 100644
--- a/libfreerdp/core/gateway/arm.c
+++ b/libfreerdp/core/gateway/arm.c
@@ -549,6 +549,7 @@ static BOOL arm_pick_base64Utf16Field(const cJSON* json, const char* name, BYTE*
 	if (!output1 || !len1)
 	{
 		WLog_ERR(TAG, "error when first unbase64 for %s", name);
+		free(output1);
 		return FALSE;
 	}