diff --git a/include/math-emu/soft-fp.h b/include/math-emu/soft-fp.h
index 3f284bc031809f6cef05a36360f2c54ca2879ad9..5650c1628383057034cbdff2504376a156aeb8f8 100644
--- a/include/math-emu/soft-fp.h
+++ b/include/math-emu/soft-fp.h
@@ -138,7 +138,7 @@ do {							\
       _FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND);		\
 } while (0)
 
-#define _FP_ROUND_ZERO(wc, X)		0
+#define _FP_ROUND_ZERO(wc, X)		(void)0
 
 #define _FP_ROUND_PINF(wc, X)				\
 do {							\