diff --git a/src/lib_jit.c b/src/lib_jit.c
index 22ca0a1a..62052159 100644
--- a/src/lib_jit.c
+++ b/src/lib_jit.c
@@ -661,6 +661,7 @@ static uint32_t jit_cpudetect(lua_State *L)
 #if LJ_HASJIT
     flags |= ((features[2] >> 0)&1) * JIT_F_SSE3;
     flags |= ((features[2] >> 19)&1) * JIT_F_SSE4_1;
+    flags |= ((features[2] >> 28)&1) * JIT_F_AVX1;
     if (vendor[2] == 0x6c65746e) {  /* Intel. */
       if ((features[0] & 0x0fff0ff0) == 0x000106c0)  /* Atom. */
 	flags |= JIT_F_LEA_AGU;
diff --git a/src/lj_jit.h b/src/lj_jit.h
index f46775c0..ed72acd8 100644
--- a/src/lj_jit.h
+++ b/src/lj_jit.h
@@ -20,10 +20,11 @@
 #define JIT_F_PREFER_IMUL	0x00000080
 #define JIT_F_LEA_AGU		0x00000100
 #define JIT_F_BMI2		0x00000200
+#define JIT_F_AVX1		0x00000400
 
 /* Names for the CPU-specific flags. Must match the order above. */
 #define JIT_F_CPU_FIRST		JIT_F_SSE2
-#define JIT_F_CPUSTRING		"\4SSE2\4SSE3\6SSE4.1\3AMD\4ATOM\4BMI2"
+#define JIT_F_CPUSTRING		"\4SSE2\4SSE3\6SSE4.1\3AMD\4ATOM\4BMI2\4AVX1"
 #elif LJ_TARGET_ARM
 #define JIT_F_ARMV6_		0x00000010
 #define JIT_F_ARMV6T2_		0x00000020