diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9e1158c77..fdf735aae 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,7 +14,7 @@ if(CMAKE_COMPILER_IS_GNUCC)
 endif(CMAKE_COMPILER_IS_GNUCC)
 
 if(CMAKE_COMPILER_IS_CLANG)
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement -Wpointer-arith -Wwrite-strings -Wdocumentation -Wunreachable-code")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement -Wpointer-arith -Wwrite-strings -Wdocumentation -Wunreachable-code -Wno-documentation-deprecated-sync")
   set(CMAKE_C_FLAGS_RELEASE "-O2")
   set(CMAKE_C_FLAGS_DEBUG "-g3 -O0")
   set(CMAKE_C_FLAGS_COVERAGE "-g3 -O0 --coverage")