diff --git a/tests/signal_test.cpp b/tests/signal_test.cpp
index e53fd3a..8fd8b72 100644
--- a/tests/signal_test.cpp
+++ b/tests/signal_test.cpp
@@ -202,7 +202,7 @@
   // arm64, x86, and x86-64. The version of glibc we're using also doesn't
   // define SA_RESTORER, but luckily it's the same value everywhere, and mips
   // doesn't use the bit for anything.
-  static const int sa_restorer = 0x4000000;
+  static const unsigned sa_restorer = 0x4000000;
 
   // See what's currently set for SIGALRM.
   struct sigaction original_sa;
@@ -210,7 +210,7 @@
   ASSERT_EQ(0, sigaction(SIGALRM, NULL, &original_sa));
   ASSERT_TRUE(original_sa.sa_handler == NULL);
   ASSERT_TRUE(original_sa.sa_sigaction == NULL);
-  ASSERT_EQ(0, original_sa.sa_flags & ~sa_restorer);
+  ASSERT_EQ(0U, original_sa.sa_flags & ~sa_restorer);
 
   // Set a traditional sa_handler signal handler.
   struct sigaction sa;
@@ -225,7 +225,7 @@
   ASSERT_EQ(0, sigaction(SIGALRM, NULL, &sa));
   ASSERT_TRUE(sa.sa_handler == EmptySignalHandler);
   ASSERT_TRUE((void*) sa.sa_sigaction == (void*) sa.sa_handler);
-  ASSERT_EQ(SA_ONSTACK, sa.sa_flags & ~sa_restorer);
+  ASSERT_EQ(static_cast<unsigned>(SA_ONSTACK), sa.sa_flags & ~sa_restorer);
 
   // Set a new-style sa_sigaction signal handler.
   memset(&sa, 0, sizeof(sa));
@@ -239,7 +239,7 @@
   ASSERT_EQ(0, sigaction(SIGALRM, NULL, &sa));
   ASSERT_TRUE(sa.sa_sigaction == EmptySignalAction);
   ASSERT_TRUE((void*) sa.sa_sigaction == (void*) sa.sa_handler);
-  ASSERT_EQ((SA_ONSTACK | SA_SIGINFO), sa.sa_flags & ~sa_restorer);
+  ASSERT_EQ(static_cast<unsigned>(SA_ONSTACK | SA_SIGINFO), sa.sa_flags & ~sa_restorer);
 
   // Put everything back how it was.
   ASSERT_EQ(0, sigaction(SIGALRM, &original_sa, NULL));