--- a/Source/cmake/WebKitCompilerFlags.cmake
+++ b/Source/cmake/WebKitCompilerFlags.cmake
@@ -162,15 +162,6 @@ if (COMPILER_IS_GCC_OR_CLANG)
         WEBKIT_PREPEND_GLOBAL_COMPILER_FLAGS(-Wno-expansion-to-defined)
     endif ()
 
-    # Force SSE2 fp on x86 builds.
-    if (WTF_CPU_X86 AND NOT CMAKE_CROSSCOMPILING)
-        WEBKIT_PREPEND_GLOBAL_COMPILER_FLAGS(-msse2 -mfpmath=sse)
-        include(DetectSSE2)
-        if (NOT SSE2_SUPPORT_FOUND)
-            message(FATAL_ERROR "SSE2 support is required to compile WebKit")
-        endif ()
-    endif ()
-
     # Makes builds faster. The GCC manual warns about the possibility that the assembler being
     # used may not support input from a pipe, but in practice the toolchains we support all do.
     WEBKIT_PREPEND_GLOBAL_COMPILER_FLAGS(-pipe)