diff --git a/test/litest.h b/test/litest.h
index 4553c878..9345d9c2 100644
--- a/test/litest.h
+++ b/test/litest.h
@@ -195,22 +195,22 @@ struct libevdev_uinput * litest_create_uinput_abs_device(const char *name,
 							 const struct input_absinfo *abs,
 							 ...);
 #define litest_assert_double_eq(a_, b_)\
-	ck_assert_int_eq((int)(a_ * 256), (int)(b_ * 256))
+	ck_assert_int_eq((int)((a_) * 256), (int)((b_) * 256))
 
 #define litest_assert_double_ne(a_, b_)\
-	ck_assert_int_ne((int)(a_ * 256), (int)(b_ * 256))
+	ck_assert_int_ne((int)((a_) * 256), (int)((b_) * 256))
 
 #define litest_assert_double_lt(a_, b_)\
-	ck_assert_int_lt((int)(a_ * 256), (int)(b_ * 256))
+	ck_assert_int_lt((int)((a_) * 256), (int)((b_) * 256))
 
 #define litest_assert_double_le(a_, b_)\
-	ck_assert_int_le((int)(a_ * 256), (int)(b_ * 256))
+	ck_assert_int_le((int)((a_) * 256), (int)((b_) * 256))
 
 #define litest_assert_double_gt(a_, b_)\
-	ck_assert_int_gt((int)(a_ * 256), (int)(b_ * 256))
+	ck_assert_int_gt((int)((a_) * 256), (int)((b_) * 256))
 
 #define litest_assert_double_ge(a_, b_)\
-	ck_assert_int_ge((int)(a_ * 256), (int)(b_ * 256))
+	ck_assert_int_ge((int)((a_) * 256), (int)((b_) * 256))
 
 void litest_timeout_tap(void);
 void litest_timeout_softbuttons(void);