diff --git a/Externals/mbedtls/library/CMakeLists.txt b/Externals/mbedtls/library/CMakeLists.txt
index fc2786c7f2..5aa233e080 100644
--- a/Externals/mbedtls/library/CMakeLists.txt
+++ b/Externals/mbedtls/library/CMakeLists.txt
@@ -122,7 +122,7 @@ if(CMAKE_COMPILER_IS_GNUCC)
 endif(CMAKE_COMPILER_IS_GNUCC)
 
 if(CMAKE_COMPILER_IS_CLANG)
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wmissing-declarations -Wmissing-prototypes -Wdocumentation -Wno-documentation-deprecated-sync -Wunreachable-code")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wmissing-declarations -Wmissing-prototypes -Wunreachable-code")
 endif(CMAKE_COMPILER_IS_CLANG)
 
 if(WIN32)