diff --git a/tools/mfc/card_only/staticnested_0nt.c b/tools/mfc/card_only/staticnested_0nt.c
index 1f58976e9..aa29afc5a 100644
--- a/tools/mfc/card_only/staticnested_0nt.c
+++ b/tools/mfc/card_only/staticnested_0nt.c
@@ -206,6 +206,7 @@ static void *generate_and_intersect_keys(void *threadarg) {
     }
 
     pthread_exit(NULL);
+    return NULL; // Make some compilers happy
 }
 
 static uint64_t **unpredictable_nested(NtpKs1List *pNKL, uint32_t keyCounts[]) {