diff --git a/cmake/QtWasmHelpers.cmake b/cmake/QtWasmHelpers.cmake
index bb6e2dede69..06810a0de35 100644
--- a/cmake/QtWasmHelpers.cmake
+++ b/cmake/QtWasmHelpers.cmake
@@ -57,7 +57,6 @@ function (qt_internal_setup_wasm_target_properties wasmTarget)
 
     # a few good defaults to make console more verbose while debugging
     target_link_options("${wasmTarget}" INTERFACE $<$<CONFIG:Debug>:
-        "SHELL:-s DEMANGLE_SUPPORT=1"
         --profiling-funcs>)
 
     # target_link_options("${wasmTarget}" INTERFACE "SHELL:-s LIBRARY_DEBUG=1") # print out library calls, verbose
diff --git a/mkspecs/common/wasm/wasm.conf b/mkspecs/common/wasm/wasm.conf
index 2a5ea231452..51fa9d7ceb3 100644
--- a/mkspecs/common/wasm/wasm.conf
+++ b/mkspecs/common/wasm/wasm.conf
@@ -42,7 +42,6 @@ EMCC_COMMON_LFLAGS += \
 # but are here in debug for clarity.
 EMCC_COMMON_LFLAGS_DEBUG = \
     $$EMCC_COMMON_LFLAGS \
-    -s DEMANGLE_SUPPORT=1 \
     # -s LIBRARY_DEBUG=1 \ #print out library calls, verbose
     # -s SYSCALL_DEBUG=1 \ #print out sys calls, verbose
     # -s FS_LOG=1 \ #print out filesystem ops, verbose