diff --git a/backend.native/tests/build.gradle b/backend.native/tests/build.gradle
index 7dc3eb650e5..c80fdc1b5de 100644
--- a/backend.native/tests/build.gradle
+++ b/backend.native/tests/build.gradle
@@ -1331,7 +1331,6 @@ task array_list1(type: RunKonanTest) {
 }
 
 task hash_map0(type: RunKonanTest) {
-    expectedFail = (project.testTarget == 'wasm32') // The test fails on wasm32 (remainder by zero)
     goldValue = "OK\n"
     source = "runtime/collections/hash_map0.kt"
 }
diff --git a/runtime/src/launcher/js/launcher.js b/runtime/src/launcher/js/launcher.js
index 2043700ca77..01d0775dba9 100644
--- a/runtime/src/launcher/js/launcher.js
+++ b/runtime/src/launcher/js/launcher.js
@@ -84,6 +84,13 @@ var konan_dependencies = {
         Konan_heap_lower: function() {
             return konanStackTop;
         },
+        Konan_heap_grow: function(pages) {
+            // The buffer is allocated anew on calls to grow(),
+            // so renew the heap array.
+            var oldLength = memory.grow(pages);
+            heap = new Uint8Array(konan_dependencies.env.memory.buffer);
+            return oldLength;
+        },
         Konan_abort: function(pointer) {
             throw new Error("Konan_abort(" + utf8decode(toString(pointer)) + ")");
         },
@@ -110,7 +117,7 @@ var konan_dependencies = {
             // Approximate it with write() to stdout for now.
             write(utf8decode(toString(str))); // TODO: write() d8 specific.
         },
-        memory: new WebAssembly.Memory({ initial: 256 })
+        memory: new WebAssembly.Memory({ initial: 256, maximum: 16384 })
     }
 };
 
@@ -124,7 +131,6 @@ module.env.tablebase = 0;
 instance = new WebAssembly.Instance(module, konan_dependencies);
 memory = konan_dependencies.env.memory
 heap = new Uint8Array(konan_dependencies.env.memory.buffer);
-heap32 = new Uint32Array(konan_dependencies.env.memory.buffer);
 konanStackTop = stackTop();
 
 try {
diff --git a/runtime/src/main/cpp/Porting.cpp b/runtime/src/main/cpp/Porting.cpp
index 5e97be1df06..6017013205b 100644
--- a/runtime/src/main/cpp/Porting.cpp
+++ b/runtime/src/main/cpp/Porting.cpp
@@ -171,11 +171,14 @@ uint64_t getTimeMicros() {
 // This one is an interface to query module.env.memory.buffer.byteLength
 extern "C" unsigned long Konan_heap_upper();
 extern "C" unsigned long Konan_heap_lower();
+extern "C" unsigned long Konan_heap_grow(unsigned long);
 
 #define MFAIL ((void*) ~(size_t)0)
-#define WASM_PAGESIZE  65536U
+#define WASM_PAGESIZE_EXPONENT 16
+#define WASM_PAGESIZE  (1u << WASM_PAGESIZE_EXPONENT)
 #define WASM_PAGEMASK ((WASM_PAGESIZE-(size_t)1))
 #define PAGE_ALIGN(value) ((value + WASM_PAGEMASK) & ~(WASM_PAGEMASK))
+#define IN_PAGES(value) (value >> WASM_PAGESIZE_EXPONENT)
 
 void* moreCore(int size) {
     static int initialized = 0;
@@ -184,7 +187,6 @@ void* moreCore(int size) {
 
     if (!initialized) {
         sbrk_top = (void*)PAGE_ALIGN(Konan_heap_lower());
-        upperHeapLimit = (void*)Konan_heap_upper();
         initialized = 1;
     }
 
@@ -197,12 +199,12 @@ void* moreCore(int size) {
     size = PAGE_ALIGN(size);
 
     void* old_sbrk_top = sbrk_top;
+    long excess = (char*)sbrk_top + size - (char*)Konan_heap_upper();
+    if (excess > 0) {
+        Konan_heap_grow(IN_PAGES(PAGE_ALIGN(excess)));
+    }
     sbrk_top = (char*)sbrk_top + size;
 
-    if (((char*)sbrk_top - (char*)upperHeapLimit) >= 0) {
-        // TODO: Consider using grow() and .maximum Memory settings.
-        abort();
-    }
     return old_sbrk_top;
 }