diff --git a/code/ColladaExporter.cpp b/code/ColladaExporter.cpp
index 4b9b1c647..dcf82a564 100644
--- a/code/ColladaExporter.cpp
+++ b/code/ColladaExporter.cpp
@@ -547,7 +547,7 @@ void ColladaExporter::WriteImageEntry( const Surface& pSurface, const std::strin
     std::stringstream imageUrlEncoded;
     for( std::string::const_iterator it = pSurface.texture.begin(); it != pSurface.texture.end(); ++it )
     {
-      if( isalnum_C( (unsigned char) *it) || *it == '_' || *it == '.' || *it == '/' || *it == '\\' )
+      if( isalnum_C( (unsigned char) *it) || *it == ':' || *it == '_' || *it == '.' || *it == '/' || *it == '\\' )
         imageUrlEncoded << *it;
       else
         imageUrlEncoded << '%' << std::hex << size_t( (unsigned char) *it) << std::dec;