diff --git a/src/kem/sike/p434/fp_generic.c b/src/kem/sike/p434/fp_generic.c
index 7fa75d1f..8634b850 100644
--- a/src/kem/sike/p434/fp_generic.c
+++ b/src/kem/sike/p434/fp_generic.c
@@ -97,8 +97,7 @@ void sike_mpmul(const felm_t a, const felm_t b, dfelm_t c)
     crypto_word_t t = 0, u = 0, v = 0, UV[2];
     unsigned int carry = 0;
 
-    // TODO: it actually needs BMI2 & ADOX. cpu_features needs to be updated
-    if (CPU_CAPS.bmi2) {
+    if (CPU_CAPS.bmi2 && CPU_CAPS.adx) {
         sike_mpmul_asm(a,b,c);
         return;
     }
@@ -138,7 +137,7 @@ void sike_mpmul(const felm_t a, const felm_t b, dfelm_t c)
 void sike_fprdc_asm(const felm_t ma, felm_t mc);
 void sike_fprdc(const felm_t ma, felm_t mc)
 {
-    if (CPU_CAPS.bmi2) {
+    if (CPU_CAPS.bmi2 && CPU_CAPS.adx) {
         sike_fprdc_asm(ma, mc);
         return;
     }