diff --git a/src/numex.h b/src/numex.h
index 2dc0ea25..7c2cebbb 100644
--- a/src/numex.h
+++ b/src/numex.h
@@ -21,7 +21,7 @@ extern "C" {
 #include "trie.h"
 #include "trie_search.h"
 
-#define DEFAULT_NUMEX_PATH LIBPOSTAL_DATA_DIR "/numex/numex.dat"
+#define DEFAULT_NUMEX_PATH LIBPOSTAL_DATA_DIR PATH_SEPARATOR "numex" PATH_SEPARATOR "numex.dat"
 
 #define GENDER_MASCULINE_PREFIX "m"
 #define GENDER_FEMININE_PREFIX "f"
@@ -152,4 +152,4 @@ void numex_module_teardown(void);
 }
 #endif
 
-#endif
\ No newline at end of file
+#endif