diff --git a/cunit/timeout.c b/cunit/timeout.c
index f02c9ac..a444ac8 100644
--- a/cunit/timeout.c
+++ b/cunit/timeout.c
@@ -197,7 +197,7 @@ int timeout_init(void (*cb)(void))
 
 int timeout_begin(int millisec)
 {
-    int c;
+    char c;
     int r;
 
 // fprintf(stderr, "timeout_begin\n");
@@ -220,7 +220,7 @@ int timeout_begin(int millisec)
 
 int timeout_end(void)
 {
-    int c;
+    char c;
     int r;
 
 // fprintf(stderr, "timeout_end\n");