diff --git a/unix/graphemes.c b/unix/graphemes.c
index 6d101a92..a2c47b72 100644
--- a/unix/graphemes.c
+++ b/unix/graphemes.c
@@ -1,5 +1,5 @@
 // 25 may 2016
-#include "uipriv_unix.H"
+#include "uipriv_unix.h"
 
 ptrdiff_t *graphemes(const char *text, PangoContext *context)
 {