diff --git a/src/kernel/libroot/os/debug.c b/src/kernel/libroot/os/debug.c
index 2b916961d4..d309a0a340 100644
--- a/src/kernel/libroot/os/debug.c
+++ b/src/kernel/libroot/os/debug.c
@@ -91,7 +91,7 @@ get_why_stopped_string(debug_why_stopped whyStopped, char *buffer,
 	if (!buffer || bufferSize <= 0)
 		return;
 
-	if (whyStopped >= 0 && whyStopped < sDebugWhyStringCount)
+	if ((int32)whyStopped >= 0 && (int32)whyStopped < sDebugWhyStringCount)
 		strlcpy(buffer, sDebugWhyStrings[whyStopped], bufferSize);
 	else
 		snprintf(buffer, bufferSize, "Unknown reason %ld", (int32)whyStopped);