diff --git a/config/cmake/LIBAEC/CMakeLists.txt b/config/cmake/LIBAEC/CMakeLists.txt
index 379902b3ec0..11f79414e2a 100644
--- a/config/cmake/LIBAEC/CMakeLists.txt
+++ b/config/cmake/LIBAEC/CMakeLists.txt
@@ -127,7 +127,7 @@ endif ()
 # Compiler specific flags : Shouldn't there be compiler tests for these
 #-----------------------------------------------------------------------------
 if (CMAKE_C_COMPILER_ID MATCHES "IntelLLVM" OR CMAKE_C_COMPILER_ID MATCHES "[Cc]lang")
-   set (CMAKE_C_FLAGS "${CMAKE_ANSI_CFLAGS} ${CMAKE_C_FLAGS} -Wno-deprecated-non-prototype")
+   set (CMAKE_C_FLAGS "${CMAKE_ANSI_CFLAGS} ${CMAKE_C_FLAGS}")
 endif ()
 
 #-----------------------------------------------------------------------------
diff --git a/config/cmake/ZLIB/CMakeLists.txt b/config/cmake/ZLIB/CMakeLists.txt
index 09f67b0dcf6..529f1446a58 100644
--- a/config/cmake/ZLIB/CMakeLists.txt
+++ b/config/cmake/ZLIB/CMakeLists.txt
@@ -132,7 +132,7 @@ if (CMAKE_COMPILER_IS_GNUCC)
   set (CMAKE_C_FLAGS "${CMAKE_ANSI_CFLAGS} ${CMAKE_C_FLAGS} -Wno-strict-prototypes")
 endif ()
 if (CMAKE_C_COMPILER_ID MATCHES "IntelLLVM" OR CMAKE_C_COMPILER_ID MATCHES "[Cc]lang")
-   set (CMAKE_C_FLAGS "${CMAKE_ANSI_CFLAGS} ${CMAKE_C_FLAGS} -Wno-deprecated-non-prototype -Wno-implicit-function-declaration")
+   set (CMAKE_C_FLAGS "${CMAKE_ANSI_CFLAGS} ${CMAKE_C_FLAGS} -Wno-implicit-function-declaration")
 endif ()
 
 #-----------------------------------------------------------------------------