diff --git a/src/modbus-data.c b/src/modbus-data.c
index 916a501ea..38ff5c14d 100644
--- a/src/modbus-data.c
+++ b/src/modbus-data.c
@@ -54,7 +54,7 @@
 #  define bswap_16 _byteswap_ushort
 #endif
 
-#if !defined(__CYGWIN__) && !defined(bswap_16)
+#if !defined(bswap_16)
 #  warning "Fallback on C functions for bswap_16"
 static inline uint16_t bswap_16(uint16_t x)
 {