diff --git a/boards/x86/qemu_x86/board.cmake b/boards/x86/qemu_x86/board.cmake
index 6083d256e85..ca0bf054fc4 100644
--- a/boards/x86/qemu_x86/board.cmake
+++ b/boards/x86/qemu_x86/board.cmake
@@ -26,9 +26,36 @@ else()
   math(EXPR QEMU_MEMORY_SIZE_MB "${CONFIG_SRAM_SIZE} / 1024")
 endif()
 
+set(QEMU_CPU_FLAGS "")
+if(CONFIG_X86_MMX)
+  string(JOIN "," QEMU_CPU_FLAGS "${QEMU_CPU_FLAGS}" "mmx")
+  string(JOIN "," QEMU_CPU_FLAGS "${QEMU_CPU_FLAGS}" "mmxext")
+endif()
+if(CONFIG_X86_SSE)
+  string(JOIN "," QEMU_CPU_FLAGS "${QEMU_CPU_FLAGS}" "sse")
+endif()
+if(CONFIG_X86_SSE2)
+  string(JOIN "," QEMU_CPU_FLAGS "${QEMU_CPU_FLAGS}" "sse2")
+endif()
+if(CONFIG_X86_SSE3)
+  string(JOIN "," QEMU_CPU_FLAGS "${QEMU_CPU_FLAGS}" "pni")
+endif()
+if(CONFIG_X86_SSSE3)
+  string(JOIN "," QEMU_CPU_FLAGS "${QEMU_CPU_FLAGS}" "ssse3")
+endif()
+if(CONFIG_X86_SSE41)
+  string(JOIN "," QEMU_CPU_FLAGS "${QEMU_CPU_FLAGS}" "sse4.1")
+endif()
+if(CONFIG_X86_SSE42)
+  string(JOIN "," QEMU_CPU_FLAGS "${QEMU_CPU_FLAGS}" "sse4.2")
+endif()
+if(CONFIG_X86_SSE4A)
+  string(JOIN "," QEMU_CPU_FLAGS "${QEMU_CPU_FLAGS}" "sse4a")
+endif()
+
 set(QEMU_FLAGS_${ARCH}
   -m ${QEMU_MEMORY_SIZE_MB}
-  -cpu ${QEMU_CPU_TYPE_${ARCH}}
+  -cpu ${QEMU_CPU_TYPE_${ARCH}}${QEMU_CPU_FLAGS}
   -device isa-debug-exit,iobase=0xf4,iosize=0x04
   ${REBOOT_FLAG}
   -nographic