diff --git a/src/base/commandlineflags.h b/src/base/commandlineflags.h
index c011df4..f77012d 100644
--- a/src/base/commandlineflags.h
+++ b/src/base/commandlineflags.h
@@ -140,9 +140,12 @@
                     : memchr("tTyY1\0", getenv(envname)[0], 6) != nullptr)
 
 #define EnvToInt(envname, dflt) \
-  (!getenv(envname) ? (dflt) : strtol(getenv(envname), nullptr, 10))
+  (!getenv(envname) ? (dflt)    \
+                    : static_cast<int>(strtol(getenv(envname), nullptr, 10)))
 
 #define EnvToUInt(envname, dflt) \
-  (!getenv(envname) ? (dflt) : strtoul(getenv(envname), nullptr, 10))
+  (!getenv(envname)              \
+       ? (dflt)                  \
+       : static_cast<unsigned>(strtoul(getenv(envname), nullptr, 10)))
 
 #endif  // BASE_COMMANDLINEFLAGS_H__
diff --git a/src/logging_unittest.cc b/src/logging_unittest.cc
index fff7660..c6aea7b 100644
--- a/src/logging_unittest.cc
+++ b/src/logging_unittest.cc
@@ -894,7 +894,7 @@ struct MyLogger : public base::Logger {
 
   void Flush() override {}
 
-  uint32 LogSize() override { return data.length(); }
+  uint32 LogSize() override { return static_cast<uint32>(data.length()); }
 
  private:
   bool* set_on_destruction_;