diff --git a/CMake/HPHPCompiler.cmake b/CMake/HPHPCompiler.cmake
index 07e3f6445cbabb..1489ef454eb2fa 100644
--- a/CMake/HPHPCompiler.cmake
+++ b/CMake/HPHPCompiler.cmake
@@ -183,9 +183,6 @@ if (${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang" OR ${CMAKE_CXX_COMPILER_ID} STREQU
 
     # ARM64
     if(IS_AARCH64)
-      # Force char type to be signed, which is not the case on aarch64.
-      list(APPEND GENERAL_OPTIONS "fsigned-char")
-
       # If a CPU was specified, build a -mcpu option for the compiler.
       set(CPU "" CACHE STRING "CPU to tell gcc to optimize for (-mcpu)")
       if(CPU)
diff --git a/hphp/runtime/ext/fileinfo/libmagic/apprentice.cpp b/hphp/runtime/ext/fileinfo/libmagic/apprentice.cpp
index fe33a6d834d0cf..9e3a336cb91c18 100644
--- a/hphp/runtime/ext/fileinfo/libmagic/apprentice.cpp
+++ b/hphp/runtime/ext/fileinfo/libmagic/apprentice.cpp
@@ -1267,7 +1267,7 @@ file_signextend(struct magic_set *ms, struct magic *m, uint64_t v)
      * the sign extension must have happened.
      */
     case FILE_BYTE:
-      v = (char) v;
+      v = (signed char) v;
       break;
     case FILE_SHORT:
     case FILE_BESHORT: