diff --git a/include/mupdf/fitz/system.h b/include/mupdf/fitz/system.h
index 0552771..42fd037 100644
--- a/include/mupdf/fitz/system.h
+++ b/include/mupdf/fitz/system.h
@@ -117,7 +117,6 @@ static __inline int signbit(double x)
 #define isinf(x) (!_finite(x))
 #endif
 
-#define hypotf _hypotf
 #define atoll _atoi64
 
 char *fz_utf8_from_wchar(const wchar_t *s);