diff --git a/modules/juce_core/zip/juce_GZIPDecompressorInputStream.cpp b/modules/juce_core/zip/juce_GZIPDecompressorInputStream.cpp
index d86e1a3bb7..04d3266027 100644
--- a/modules/juce_core/zip/juce_GZIPDecompressorInputStream.cpp
+++ b/modules/juce_core/zip/juce_GZIPDecompressorInputStream.cpp
@@ -79,6 +79,15 @@ namespace zlibNamespace
   #endif
  #else
   #include JUCE_ZLIB_INCLUDE_PATH
+
+  #ifndef z_uInt
+   #ifdef uInt
+    #define z_uInt uInt
+   #else
+    #define z_uInt unsigned int
+   #endif
+  #endif
+
  #endif
 }