diff --git a/index.js b/index.js
index 9cbac819..593a4177 100644
--- a/index.js
+++ b/index.js
@@ -189,7 +189,11 @@ exports.evm2wast = function (evmCode, opts = {
     if (opts.chargePerOp) {
       segment += `(call $useGas (i64.const ${op.fee})) `
     }
-    gasCount += op.fee
+    // do not charge gas for interface methods
+    // TODO: implement proper gas charging and enable this here
+    if (opint < 0x30 || (opint > 0x45 && opint < 0xa0)) {
+      gasCount += op.fee
+    }
 
     segmentStackDeta += op.on
     if (segmentStackDeta > segmentStackHigh) {