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diff --git a/src/butil/containers/case_ignored_flat_map.cpp b/src/butil/containers/case_ignored_flat_map.cpp
index 7f2fadc5..a7471561 100644
--- a/src/butil/containers/case_ignored_flat_map.cpp
+++ b/src/butil/containers/case_ignored_flat_map.cpp
@@ -19,7 +19,7 @@
namespace butil {
-static const char g_tolower_map_base[] = {
+static const signed char g_tolower_map_base[] = {
-128, -127, -126, -125, -124, -123, -122, -121, -120,
-119, -118, -117, -116, -115, -114, -113, -112, -111, -110,
-109, -108, -107, -106, -105, -104, -103, -102, -101, -100,
@@ -48,6 +48,6 @@ static const char g_tolower_map_base[] = {
120, 121, 122, 123, 124, 125, 126, 127
};
-extern const char* const g_tolower_map = g_tolower_map_base + 128;
+extern const signed char* const g_tolower_map = g_tolower_map_base + 128;
} // namespace butil
diff --git a/src/butil/containers/case_ignored_flat_map.h b/src/butil/containers/case_ignored_flat_map.h
index ed6e58b4..6bc1a9af 100644
--- a/src/butil/containers/case_ignored_flat_map.h
+++ b/src/butil/containers/case_ignored_flat_map.h
@@ -27,7 +27,7 @@ namespace butil {
// NOTE: Using ascii_tolower instead of ::tolower shortens 150ns in
// FlatMapTest.perf_small_string_map (with -O2 added, -O0 by default)
inline char ascii_tolower(char c) {
- extern const char* const g_tolower_map;
+ extern const signed char* const g_tolower_map;
return g_tolower_map[(int)c];
}
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