diff --git a/cmake/QtCompilerOptimization.cmake b/cmake/QtCompilerOptimization.cmake
index 19504c84fbb..8f23a6acf9d 100644
--- a/cmake/QtCompilerOptimization.cmake
+++ b/cmake/QtCompilerOptimization.cmake
@@ -1,16 +1,3 @@
-if (QCC)
-    set(QT_CFLAGS_SSE2      "-msse2")
-    set(QT_CFLAGS_SSE3      "-msse3")
-    set(QT_CFLAGS_SSSE3     "-mssse3")
-    set(QT_CFLAGS_SSE4_1    "-msse4.1")
-    set(QT_CFLAGS_SSE4_2    "-msse4.2")
-    set(QT_CFLAGS_AVX       "-mavx")
-    set(QT_CFLAGS_AVX2      "-mavx2")
-    set(QT_CFLAGS_ARCH_HASWELL "-march=haswell")
-    set(QT_CFLAGS_AESNI     "-maes")
-    set(QT_CFLAGS_SHANI     "-msha")
-endif()
-
 if (MSVC)
     if (QT_64BIT)
         # SSE2 is mandatory on 64-bit mode, so skip the option. It triggers:
@@ -43,7 +30,7 @@ if (MSVC)
     set(QT_CFLAGS_AVX512VBMI "-arch:AVX512")
 endif()
 
-if(GCC OR CLANG)
+if(GCC OR CLANG OR QCC)
     set(QT_CFLAGS_SSE2       "-msse2")
     set(QT_CFLAGS_SSE3       "-msse3")
     set(QT_CFLAGS_SSSE3      "-mssse3")