diff --git a/source/cpu/cpuid_arm.go b/source/cpu/cpuid_arm.go
index 6a142e913..2ac749543 100644
--- a/source/cpu/cpuid_arm.go
+++ b/source/cpu/cpuid_arm.go
@@ -95,8 +95,8 @@ func getCpuidFlags() []string {
 	hwcap := uint64(C.gethwcap())
 	for i := uint(0); i < 64; i++ {
 		key := uint64(1 << i)
-		val := flagNames_arm[key]
-		if hwcap&key != 0 {
+		val, ok := flagNames_arm[key]
+		if hwcap&key != 0 && ok {
 			r = append(r, val)
 		}
 	}
diff --git a/source/cpu/cpuid_arm64.go b/source/cpu/cpuid_arm64.go
index e4175ae49..32f168cd5 100644
--- a/source/cpu/cpuid_arm64.go
+++ b/source/cpu/cpuid_arm64.go
@@ -85,8 +85,8 @@ func getCpuidFlags() []string {
 	hwcap := uint64(C.gethwcap())
 	for i := uint(0); i < 64; i++ {
 		key := uint64(1 << i)
-		val := flagNames_arm64[key]
-		if hwcap&key != 0 {
+		val, ok := flagNames_arm64[key]
+		if hwcap&key != 0 && ok {
 			r = append(r, val)
 		}
 	}
diff --git a/source/cpu/cpuid_ppc64le.go b/source/cpu/cpuid_ppc64le.go
index 307739717..a487b14e1 100644
--- a/source/cpu/cpuid_ppc64le.go
+++ b/source/cpu/cpuid_ppc64le.go
@@ -132,15 +132,15 @@ func getCpuidFlags() []string {
 	hwcap2 := uint64(C.gethwcap2())
 	for i := uint(0); i < 64; i++ {
 		key := uint64(1 << i)
-		val := flagNames_ppc64le[key]
-		if hwcap&key != 0 {
+		val, ok := flagNames_ppc64le[key]
+		if hwcap&key != 0 && ok {
 			r = append(r, val)
 		}
 	}
 	for i := uint(0); i < 64; i++ {
 		key := uint64(1 << i)
-		val := flag2Names_ppc64le[key]
-		if hwcap2&key != 0 {
+		val, ok := flag2Names_ppc64le[key]
+		if hwcap2&key != 0 && ok {
 			r = append(r, val)
 		}
 	}
diff --git a/source/cpu/cpuid_s390x.go b/source/cpu/cpuid_s390x.go
index 339761834..6ecb4ac43 100644
--- a/source/cpu/cpuid_s390x.go
+++ b/source/cpu/cpuid_s390x.go
@@ -84,8 +84,8 @@ func getCpuidFlags() []string {
 	hwcap := uint64(C.gethwcap())
 	for i := uint(0); i < 64; i++ {
 		key := uint64(1 << i)
-		val := flagNames_s390x[key]
-		if hwcap&key != 0 {
+		val, ok := flagNames_s390x[key]
+		if hwcap&key != 0 && ok {
 			r = append(r, val)
 		}
 	}