diff --git a/unittests/ADT/APIntTest.cpp b/unittests/ADT/APIntTest.cpp
index 7b03d0f..0b13aa4 100644
--- a/unittests/ADT/APIntTest.cpp
+++ b/unittests/ADT/APIntTest.cpp
@@ -316,14 +316,14 @@
 }
 
 TEST(APIntTest, Log2) {
-  EXPECT_EQ(APInt(15, 7).logBase2(), 2);
-  EXPECT_EQ(APInt(15, 7).ceilLogBase2(), 3);
+  EXPECT_EQ(APInt(15, 7).logBase2(), 2U);
+  EXPECT_EQ(APInt(15, 7).ceilLogBase2(), 3U);
   EXPECT_EQ(APInt(15, 7).exactLogBase2(), -1);
-  EXPECT_EQ(APInt(15, 8).logBase2(), 3);
-  EXPECT_EQ(APInt(15, 8).ceilLogBase2(), 3);
+  EXPECT_EQ(APInt(15, 8).logBase2(), 3U);
+  EXPECT_EQ(APInt(15, 8).ceilLogBase2(), 3U);
   EXPECT_EQ(APInt(15, 8).exactLogBase2(), 3);
-  EXPECT_EQ(APInt(15, 9).logBase2(), 3);
-  EXPECT_EQ(APInt(15, 9).ceilLogBase2(), 4);
+  EXPECT_EQ(APInt(15, 9).logBase2(), 3U);
+  EXPECT_EQ(APInt(15, 9).ceilLogBase2(), 4U);
   EXPECT_EQ(APInt(15, 9).exactLogBase2(), -1);
 }