diff --git a/extras/Introjucer/Source/Project/jucer_Project.cpp b/extras/Introjucer/Source/Project/jucer_Project.cpp
index b96fd43609..8fd9b44fdc 100644
--- a/extras/Introjucer/Source/Project/jucer_Project.cpp
+++ b/extras/Introjucer/Source/Project/jucer_Project.cpp
@@ -293,13 +293,12 @@ File Project::resolveFilename (String filename) const
     if (filename.isEmpty())
         return File::nonexistent;
 
-    filename = replacePreprocessorDefs (getPreprocessorDefs(), filename)
-                .replaceCharacter ('\\', '/');
+    filename = replacePreprocessorDefs (getPreprocessorDefs(), filename);
 
     if (FileHelpers::isAbsolutePath (filename))
-        return File::createFileWithoutCheckingPath (filename); // (avoid assertions for windows-style paths)
+        return File::createFileWithoutCheckingPath (FileHelpers::currentOSStylePath (filename)); // (avoid assertions for windows-style paths)
 
-    return getFile().getSiblingFile (filename);
+    return getFile().getSiblingFile (FileHelpers::currentOSStylePath (filename));
 }
 
 String Project::getRelativePathForFile (const File& file) const
diff --git a/extras/Introjucer/Source/Utility/jucer_FileHelpers.cpp b/extras/Introjucer/Source/Utility/jucer_FileHelpers.cpp
index cadd90bfcb..36f960bd2f 100644
--- a/extras/Introjucer/Source/Utility/jucer_FileHelpers.cpp
+++ b/extras/Introjucer/Source/Utility/jucer_FileHelpers.cpp
@@ -102,14 +102,16 @@ namespace FileHelpers
         return false;
     }
 
-    String unixStylePath (const String& path)
-    {
-        return path.replaceCharacter ('\\', '/');
-    }
+    String unixStylePath (const String& path)       { return path.replaceCharacter ('\\', '/'); }
+    String windowsStylePath (const String& path)    { return path.replaceCharacter ('/', '\\'); }
 
-    String windowsStylePath (const String& path)
+    String currentOSStylePath (const String& path)
     {
-        return path.replaceCharacter ('/', '\\');
+       #if JUCE_WINDOWS
+        return windowsStylePath (path);
+       #else
+        return unixStylePath (path);
+       #endif
     }
 
     bool isAbsolutePath (const String& path)
diff --git a/extras/Introjucer/Source/Utility/jucer_FileHelpers.h b/extras/Introjucer/Source/Utility/jucer_FileHelpers.h
index 698f14f268..b93e089331 100644
--- a/extras/Introjucer/Source/Utility/jucer_FileHelpers.h
+++ b/extras/Introjucer/Source/Utility/jucer_FileHelpers.h
@@ -41,6 +41,7 @@ namespace FileHelpers
 
     String unixStylePath (const String& path);
     String windowsStylePath (const String& path);
+    String currentOSStylePath (const String& path);
 
     bool shouldPathsBeRelative (String path1, String path2);
     bool isAbsolutePath (const String& path);