diff --git a/common/rfb/encodings.cxx b/common/rfb/encodings.cxx
index 6aa81c4..97f547b 100644
--- a/common/rfb/encodings.cxx
+++ b/common/rfb/encodings.cxx
@@ -34,7 +34,7 @@
   return -1;
 }
 
-const char* rfb::encodingName(unsigned int num)
+const char* rfb::encodingName(int num)
 {
   switch (num) {
   case encodingRaw:      return "raw";