diff --git a/drm/UEventListener.cpp b/drm/UEventListener.cpp
index 44c503d..8d33ad2 100644
--- a/drm/UEventListener.cpp
+++ b/drm/UEventListener.cpp
@@ -79,7 +79,7 @@
 
     bool drm_event = false;
     bool hotplug_event = false;
-    for (uint32_t i = 0; i < ret;) {
+    for (uint32_t i = 0; (ssize_t)i < ret;) {
       char *event = buffer + i;
       if (strcmp(event, "DEVTYPE=drm_minor") != 0)
         drm_event = true;