diff --git a/src/osgPlugins/pnm/ReaderWriterPNM.cpp b/src/osgPlugins/pnm/ReaderWriterPNM.cpp
index 5da6bb9f6..adb99009b 100644
--- a/src/osgPlugins/pnm/ReaderWriterPNM.cpp
+++ b/src/osgPlugins/pnm/ReaderWriterPNM.cpp
@@ -383,7 +383,7 @@ class ReaderWriterPNM : public osgDB::ReaderWriter
             std::string fileName = osgDB::findDataFile( file, options );
             if (fileName.empty()) return ReadResult::FILE_NOT_FOUND;
 
-            std::ifstream fin(fileName.c_str());
+            std::ifstream fin(fileName.c_str(), std::ios_base::in | std::ios_base::binary);
             if (!fin.good())
                 return ReadResult::ERROR_IN_READING_FILE;