diff --git a/src/preamble.js b/src/preamble.js
index 7ba3754e88051..eaec26460ab79 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -48,6 +48,10 @@ if (typeof WebAssembly != 'object') {
 #include "runtime_safe_heap.js"
 #endif
 
+#if SHARED_MEMORY && ALLOW_MEMORY_GROWTH
+#include "growableHeap.js"
+#endif
+
 #if USE_ASAN
 #include "runtime_asan.js"
 #endif
diff --git a/src/preamble_minimal.js b/src/preamble_minimal.js
index a49ca40962d44..322adb69982e4 100644
--- a/src/preamble_minimal.js
+++ b/src/preamble_minimal.js
@@ -8,6 +8,10 @@
 #include "runtime_safe_heap.js"
 #endif
 
+#if SHARED_MEMORY && ALLOW_MEMORY_GROWTH
+#include "growableHeap.js"
+#endif
+
 #if USE_ASAN
 #include "runtime_asan.js"
 #endif
diff --git a/tools/acorn-optimizer.mjs b/tools/acorn-optimizer.mjs
index a6932295e1f5c..61ddfed3d69ca 100755
--- a/tools/acorn-optimizer.mjs
+++ b/tools/acorn-optimizer.mjs
@@ -1251,6 +1251,12 @@ function littleEndianHeap(ast) {
 // in each access), see #8365.
 function growableHeap(ast) {
   recursiveWalk(ast, {
+    FunctionDeclaration(node, c) {
+      // Do not recurse into to GROWABLE_HEAP_ helper functions themselves.
+      if (!(node.id.type === 'Identifier' && node.id.name.startsWith('GROWABLE_HEAP_'))) {
+        c(node.body);
+      }
+    },
     AssignmentExpression: (node) => {
       if (node.left.type === 'Identifier' && isEmscriptenHEAP(node.left.name)) {
         // Don't transform initial setup of the arrays.
diff --git a/tools/building.py b/tools/building.py
index c1caf75ca6840..81e3781b38c73 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -1055,12 +1055,7 @@ def little_endian_heap(js_file):
 
 def apply_wasm_memory_growth(js_file):
   logger.debug('supporting wasm memory growth with pthreads')
-  fixed = acorn_optimizer(js_file, ['growableHeap'])
-  ret = js_file + '.pgrow.js'
-  fixed = utils.read_file(fixed)
-  support_code = utils.read_file(path_from_root('src/growableHeap.js'))
-  utils.write_file(ret, support_code + '\n' + fixed)
-  return ret
+  return acorn_optimizer(js_file, ['growableHeap'])
 
 
 def use_unsigned_pointers_in_js(js_file):