diff --git a/Makefile.x86_64 b/Makefile.x86_64
index dbee28079..1b7fe3ef4 100644
--- a/Makefile.x86_64
+++ b/Makefile.x86_64
@@ -25,6 +25,17 @@ endif
 endif
 endif
 
+ifeq ($(CORE), HASWELL)
+ifndef DYNAMIC_ARCH
+ifndef NO_AVX2
+CCOMMON_OPT += -mavx2
+FCOMMON_OPT += -mavx2
+endif
+endif
+endif
+
+
+
 ifeq ($(OSNAME), Interix)
 ARFLAGS		= -m x64
 endif
diff --git a/cmake/system.cmake b/cmake/system.cmake
index d803bb9eb..a060d98cb 100644
--- a/cmake/system.cmake
+++ b/cmake/system.cmake
@@ -42,9 +42,19 @@ if (DEFINED BINARY AND DEFINED TARGET AND BINARY EQUAL 32)
 endif ()
 
 if (DEFINED TARGET)
-if (${TARGET} STREQUAL "SKYLAKEX" AND NOT NO_AVX512)
-  set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -march=skylake-avx512")
-endif()
+  if (${TARGET} STREQUAL "SKYLAKEX" AND NOT NO_AVX512)
+    set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -march=skylake-avx512")
+  endif()
+  if (${TARGET} STREQUAL "HASWELL" AND NOT NO_AVX2)
+    if (${CMAKE_C_COMPILER_ID} STREQUAL "GNU")
+      execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION)
+      if (${GCC_VERSION} VERSION_GREATER 4.7 OR ${GCC_VERSION} VERSION_EQUAL 4.7)
+        set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -mavx2")
+      endif()
+    elseif (${CMAKE_C_COMPILER_ID} STREQUAL "CLANG")
+      set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -mavx2")
+    endif()
+  endif()
 endif()
 
 if (DEFINED TARGET)