diff --git a/lib/make/crypto.js b/lib/make/crypto.js
index 4e0ab5b..3696afe 100644
--- a/lib/make/crypto.js
+++ b/lib/make/crypto.js
@@ -16,7 +16,7 @@ class crypto extends make {
     ]
   }
   static randomKeyFormat () {
-    return random.item(this.keyFormats)
+    return random.item(crypto.keyFormats)
   }
 
   static get keyTypes () {
@@ -27,7 +27,7 @@ class crypto extends make {
     ]
   }
   static randomKeyType () {
-    return random.item(this.keyTypes)
+    return random.item(crypto.keyTypes)
   }
 
   static get keyUsages () {
@@ -44,7 +44,7 @@ class crypto extends make {
   }
 
   static randomKeyUsage () {
-    return random.subset(this.keyUsages)
+    return random.subset(crypto.keyUsages)
   }
 
   static get curves () {
@@ -56,7 +56,7 @@ class crypto extends make {
   }
 
   static randomCurve () {
-    return random.item(this.curves)
+    return random.item(crypto.curves)
   }
 
   static get jwkUsages () {
@@ -67,7 +67,7 @@ class crypto extends make {
   }
 
   static randomJwkUsage () {
-    return random.subset(this.keyUsages)
+    return random.subset(crypto.keyUsages)
   }
 
   static get jwkKeyTypes () {
@@ -79,7 +79,7 @@ class crypto extends make {
   }
 
   static randomJwkKeyType () {
-    return random.subset(this.jwkKeyTypes)
+    return random.subset(crypto.jwkKeyTypes)
   }
 
   static get algorithmNames () {
@@ -181,11 +181,11 @@ class crypto extends make {
   }
 
   static randomAlgorithmName (method) {
-    return random.item(this.algorithmNames[method])
+    return random.item(crypto.algorithmNames[method])
   }
 
   static randomDigestName () {
-    return random.item(this.algorithmNames.digest)
+    return random.item(crypto.algorithmNames.digest)
   }
 
   static get algorithms () {