diff --git a/cmake/CommonCompilerFlags.cmake b/cmake/CommonCompilerFlags.cmake
index 59fc03e29..d45400dd8 100644
--- a/cmake/CommonCompilerFlags.cmake
+++ b/cmake/CommonCompilerFlags.cmake
@@ -32,6 +32,7 @@ if(ENABLE_WARNING_ERROR)
 endif()
 
 list(APPEND COMMON_COMPILER_FLAGS -fno-omit-frame-pointer -Wredundant-decls)
+list(APPEND COMMON_COMPILER_FLAGS -fsigned-char)
 
 include(ExportAllSymbols)
 include(CompilerSanitizerOptions)