diff --git a/code/Q3BSP/Q3BSPFileImporter.cpp b/code/Q3BSP/Q3BSPFileImporter.cpp
index 4add00a07..a492cc92a 100644
--- a/code/Q3BSP/Q3BSPFileImporter.cpp
+++ b/code/Q3BSP/Q3BSPFileImporter.cpp
@@ -616,7 +616,7 @@ bool Q3BSPFileImporter::importTextureFromArchive( const Q3BSP::Q3BSPModel *model
             // We'll leave it up to the user to figure out which extension the file has.
             aiString name;
             strncpy( name.data, pTexture->strName, sizeof name.data );
-            name.length = strlen( name.data );
+            name.length = (ai_uint32)strlen( name.data );
             pMatHelper->AddProperty( &name, AI_MATKEY_TEXTURE_DIFFUSE( 0 ) );
         }
     }