diff --git a/include/postmac.h b/include/postmac.h
index bfeb88dfd34c..1108c685ab23 100644
--- a/include/postmac.h
+++ b/include/postmac.h
@@ -21,5 +21,6 @@
 #undef Size
 #undef TimeValue
 #undef TimeRecord
+#undef UInt
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/premac.h b/include/premac.h
index 5a2707d19617..dc76edade8a4 100644
--- a/include/premac.h
+++ b/include/premac.h
@@ -21,5 +21,6 @@
 #define Size MacOSSize
 #define TimeValue MacOSTimeValue
 #define TimeRecord MacOSTimeRecord
+#define UInt MacOSUInt
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */