diff --git a/mccode_antlr/translators/c_header.py b/mccode_antlr/translators/c_header.py
index 2a7576a..ebe6cac 100644
--- a/mccode_antlr/translators/c_header.py
+++ b/mccode_antlr/translators/c_header.py
@@ -275,7 +275,7 @@ def source_file_contents():
 #else
 int traceenabled = 0;
 #endif
-#define {runtime.get("name", "none").upper()} "{escape_str_for_c(include_path)}"
+#define {runtime.get("name", "none").upper()} "{escape_str_for_c(str(include_path))}"
 int   defaultmain         = {1 if config.get("default_main") else 0};
 char  instrument_name[]   = "{source.name}";
 char  instrument_source[] = "{escape_str_for_c(source.source)}";