diff --git a/util/misc/uuid_test.cc b/util/misc/uuid_test.cc
index 39ccf6b..01f3b6a 100644
--- a/util/misc/uuid_test.cc
+++ b/util/misc/uuid_test.cc
@@ -19,6 +19,7 @@
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/format_macros.h"
 #include "base/strings/stringprintf.h"
 #include "gtest/gtest.h"
 
@@ -180,8 +181,8 @@ TEST(UUID, FromString) {
 
   for (size_t index = 0; index < arraysize(kCases); ++index) {
     const TestCase& test_case = kCases[index];
-    SCOPED_TRACE(
-        base::StringPrintf("index %zu: %s", index, test_case.uuid_string));
+    SCOPED_TRACE(base::StringPrintf(
+        "index %" PRIuS ": %s", index, test_case.uuid_string));
 
     UUID uuid;
     EXPECT_EQ(test_case.success,
diff --git a/util/numeric/checked_range_test.cc b/util/numeric/checked_range_test.cc
index 37d482c..9c72526 100644
--- a/util/numeric/checked_range_test.cc
+++ b/util/numeric/checked_range_test.cc
@@ -19,6 +19,7 @@
 #include <limits>
 
 #include "base/basictypes.h"
+#include "base/format_macros.h"
 #include "base/strings/stringprintf.h"
 #include "gtest/gtest.h"
 
@@ -78,7 +79,8 @@ TEST(CheckedRange, IsValid) {
 
   for (size_t index = 0; index < arraysize(kUnsignedTestData); ++index) {
     const UnsignedTestData& testcase = kUnsignedTestData[index];
-    SCOPED_TRACE(base::StringPrintf("unsigned index %zu, base 0x%x, size 0x%x",
+    SCOPED_TRACE(base::StringPrintf("unsigned index %" PRIuS
+                                    ", base 0x%x, size 0x%x",
                                     index,
                                     testcase.base,
                                     testcase.size));
@@ -139,7 +141,8 @@ TEST(CheckedRange, IsValid) {
 
   for (size_t index = 0; index < arraysize(kSignedTestData); ++index) {
     const SignedTestData& testcase = kSignedTestData[index];
-    SCOPED_TRACE(base::StringPrintf("signed index %zu, base 0x%x, size 0x%x",
+    SCOPED_TRACE(base::StringPrintf("signed index %" PRIuS
+                                    ", base 0x%x, size 0x%x",
                                     index,
                                     testcase.base,
                                     testcase.size));
@@ -184,8 +187,8 @@ TEST(CheckedRange, ContainsValue) {
 
   for (size_t index = 0; index < arraysize(kTestData); ++index) {
     const TestData& testcase = kTestData[index];
-    SCOPED_TRACE(
-        base::StringPrintf("index %zu, value 0x%x", index, testcase.value));
+    SCOPED_TRACE(base::StringPrintf(
+        "index %" PRIuS ", value 0x%x", index, testcase.value));
 
     EXPECT_EQ(testcase.valid, parent_range.ContainsValue(testcase.value));
   }
@@ -232,7 +235,7 @@ TEST(CheckedRange, ContainsRange) {
 
   for (size_t index = 0; index < arraysize(kTestData); ++index) {
     const TestData& testcase = kTestData[index];
-    SCOPED_TRACE(base::StringPrintf("index %zu, base 0x%x, size 0x%x",
+    SCOPED_TRACE(base::StringPrintf("index %" PRIuS ", base 0x%x, size 0x%x",
                                     index,
                                     testcase.base,
                                     testcase.size));
diff --git a/util/stdlib/strlcpy_test.cc b/util/stdlib/strlcpy_test.cc
index 0fac9e0..b9af201 100644
--- a/util/stdlib/strlcpy_test.cc
+++ b/util/stdlib/strlcpy_test.cc
@@ -19,6 +19,7 @@
 #include <algorithm>
 
 #include "base/basictypes.h"
+#include "base/format_macros.h"
 #include "base/strings/string16.h"
 #include "base/strings/stringprintf.h"
 #include "gtest/gtest.h"
@@ -45,9 +46,10 @@ TEST(strlcpy, c16lcpy) {
   for (size_t index = 0; index < arraysize(test_characters); ++index) {
     base::char16 test_character = test_characters[index];
     SCOPED_TRACE(base::StringPrintf(
-        "character index %zu, character 0x%x", index, test_character));
+        "character index %" PRIuS ", character 0x%x", index, test_character));
     for (size_t length = 0; length < 256; ++length) {
-      SCOPED_TRACE(base::StringPrintf("index %zu", length));
+      SCOPED_TRACE(
+          base::StringPrintf("index %" PRIuS, length));
       base::string16 test_string(length, test_character);
 
       TestBuffer destination;