diff --git a/cmake/QtWasmHelpers.cmake b/cmake/QtWasmHelpers.cmake
index 9bd98368f5..29478b33a4 100644
--- a/cmake/QtWasmHelpers.cmake
+++ b/cmake/QtWasmHelpers.cmake
@@ -8,7 +8,8 @@ function (qt_internal_setup_wasm_target_properties wasmTarget)
     target_link_options("${wasmTarget}" INTERFACE
     "SHELL:-s MAX_WEBGL_VERSION=2"
     "SHELL:-s FETCH=1"
-    "SHELL:-s WASM_BIGINT=1")
+    "SHELL:-s WASM_BIGINT=1"
+    "SHELL:-s STACK_SIZE=5MB")
 
     target_link_libraries("${wasmTarget}" INTERFACE embind)
 
diff --git a/mkspecs/common/wasm/wasm.conf b/mkspecs/common/wasm/wasm.conf
index 6fb1fb6ea3..b67d721352 100644
--- a/mkspecs/common/wasm/wasm.conf
+++ b/mkspecs/common/wasm/wasm.conf
@@ -36,7 +36,8 @@ EMCC_COMMON_LFLAGS += \
     -s FETCH=1 \
     -s MODULARIZE=1 \
     -s EXPORT_NAME=createQtAppInstance \
-    -s WASM_BIGINT=1
+    -s WASM_BIGINT=1 \
+    -s STACK_SIZE=5MB
 
 # The -s arguments can also be used with release builds,
 # but are here in debug for clarity.