diff --git a/core/src/main/java/org/teavm/backend/wasm/generate/gc/classes/WasmGCTypeMapper.java b/core/src/main/java/org/teavm/backend/wasm/generate/gc/classes/WasmGCTypeMapper.java
index 3f9aeaa3b..6bc07335e 100644
--- a/core/src/main/java/org/teavm/backend/wasm/generate/gc/classes/WasmGCTypeMapper.java
+++ b/core/src/main/java/org/teavm/backend/wasm/generate/gc/classes/WasmGCTypeMapper.java
@@ -129,7 +129,8 @@ public class WasmGCTypeMapper {
             }
             if (result == null) {
                 if (className.equals(Address.class.getName())) {
-                    typeCache.put(className, WasmType.INT32);
+                    result = WasmType.INT32;
+                    typeCache.put(className, result);
                 } else {
                     var cls = classes.get(className);
                     if (cls == null) {
diff --git a/core/src/main/java/org/teavm/backend/wasm/intrinsics/gc/WasmGCIntrinsics.java b/core/src/main/java/org/teavm/backend/wasm/intrinsics/gc/WasmGCIntrinsics.java
index 348ee01d0..4276a79c0 100644
--- a/core/src/main/java/org/teavm/backend/wasm/intrinsics/gc/WasmGCIntrinsics.java
+++ b/core/src/main/java/org/teavm/backend/wasm/intrinsics/gc/WasmGCIntrinsics.java
@@ -187,9 +187,8 @@ public class WasmGCIntrinsics implements WasmGCIntrinsicProvider {
 
     private void fillLaxMalloc() {
         laxMallocIntrinsic = new LaxMallocIntrinsic();
-        add(new MethodReference(LaxMalloc.class, "laxMalloc", int.class, Address.class), laxMallocIntrinsic);
-        add(new MethodReference(LaxMalloc.class, "laxCalloc", int.class, Address.class), laxMallocIntrinsic);
-        add(new MethodReference(LaxMalloc.class, "laxFree", Address.class, void.class), laxMallocIntrinsic);
+        add(new MethodReference(LaxMalloc.class, "addrHeap", int.class, Address.class), laxMallocIntrinsic);
+        add(new MethodReference(LaxMalloc.class, "growHeapOuter", int.class, int.class), laxMallocIntrinsic);
         add(new MethodReference(LaxMalloc.class, "getHeapMinAddr", Address.class), laxMallocIntrinsic);
         add(new MethodReference(LaxMalloc.class, "getHeapMaxAddr", Address.class), laxMallocIntrinsic);
     }