diff --git a/test/bit_utils_test.cc b/test/bit_utils_test.cc
index 8937cbc..2e5c812 100644
--- a/test/bit_utils_test.cc
+++ b/test/bit_utils_test.cc
@@ -23,18 +23,18 @@ TEST(UtilsTest, IsBitSet) {
   for (size_t bit_set = 0; bit_set < 32; ++bit_set) {
     const uint32_t value = 1UL << bit_set;
     for (size_t i = 0; i < 32; ++i) {
-      EXPECT_EQ(IsBitSet(value, i), i == bit_set);
+      EXPECT_EQ((bool)IsBitSet(value, i), i == bit_set);
     }
   }
 
   // testing 0, all bits should be 0.
   for (size_t i = 0; i < 32; ++i) {
-    EXPECT_FALSE(IsBitSet(0, i));
+    EXPECT_FALSE((bool)IsBitSet(0, i));
   }
 
   // testing ~0, all bits should be 1.
   for (size_t i = 0; i < 32; ++i) {
-    EXPECT_TRUE(IsBitSet(-1, i));
+    EXPECT_TRUE((bool)IsBitSet(-1, i));
   }
 }