diff --git a/common/rfb/EncodeManager.cxx b/common/rfb/EncodeManager.cxx
index e632387..4e133d3 100644
--- a/common/rfb/EncodeManager.cxx
+++ b/common/rfb/EncodeManager.cxx
@@ -152,7 +152,7 @@
 
 void EncodeManager::logStats()
 {
-  int i, j;
+  size_t i, j;
 
   unsigned rects;
   unsigned long long pixels, bytes, equivalent;
@@ -603,7 +603,7 @@
   Encoder *encoder;
 
   struct RectInfo info;
-  int divisor, maxColours;
+  unsigned int divisor, maxColours;
 
   bool useRLE;
   EncoderType type;
diff --git a/common/rfb/TightEncoder.cxx b/common/rfb/TightEncoder.cxx
index ec19c2e..fe2470b 100644
--- a/common/rfb/TightEncoder.cxx
+++ b/common/rfb/TightEncoder.cxx
@@ -201,7 +201,7 @@
   }
 
   while (count) {
-    int iter_count;
+    unsigned int iter_count;
 
     iter_count = sizeof(rgb)/3;
     if (iter_count > count)
diff --git a/common/rfb/VNCServerST.cxx b/common/rfb/VNCServerST.cxx
index 51cb86c..199524e 100644
--- a/common/rfb/VNCServerST.cxx
+++ b/common/rfb/VNCServerST.cxx
@@ -544,7 +544,7 @@
   if (!deferPending)
     return true;
 
-  if (msSince(&deferStart) >= deferUpdateTime)
+  if (msSince(&deferStart) >= (unsigned)deferUpdateTime)
     return true;
 
   return false;