diff --git a/source/crypto_explore_certificate.ts b/source/crypto_explore_certificate.ts
index 12c62fe..8b08e9b 100644
--- a/source/crypto_explore_certificate.ts
+++ b/source/crypto_explore_certificate.ts
@@ -242,7 +242,7 @@ function readBasicConstraint2_5_29_19(buffer: Buffer, block: BlockInfo): BasicCo
     let pathLengthConstraint = 0;
     let breakControl = 0;
     
-    for (const inner_block: BlockInfo in inner_blocks) {
+    for (const inner_block of inner_blocks) {
         switch(inner_block.tag) {
             case TagType.BOOLEAN:
                 cA = _readBooleanValue(buffer, inner_block);