diff --git a/config_host.mk.in b/config_host.mk.in
index 5cd8b0dbcede..cdf47d5072b9 100644
--- a/config_host.mk.in
+++ b/config_host.mk.in
@@ -148,6 +148,7 @@ export DPKG=@DPKG@
 export EBOOK_CFLAGS=$(gb_SPACE)@EBOOK_CFLAGS@
 export EBOOK_LIBS=$(gb_SPACE)@EBOOK_LIBS@
 export EMSDK_FILE_PACKAGER=@EMSDK_FILE_PACKAGER@
+export EMSCRIPTEN_EXTRA_QTLOADER_CONFIG=@EMSCRIPTEN_EXTRA_QTLOADER_CONFIG@
 export EMSCRIPTEN_EXTRA_SOFFICE_PRE_JS=@EMSCRIPTEN_EXTRA_SOFFICE_PRE_JS@
 export EMSCRIPTEN_WORKERJS=@EMSCRIPTEN_WORKERJS@
 export ENABLE_ANDROID_LOK=@ENABLE_ANDROID_LOK@
diff --git a/configure.ac b/configure.ac
index 303c445453d6..b00228c511b0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1505,6 +1505,7 @@ if test "$_os" = "Emscripten"; then
     fi
 fi
 AC_SUBST(EMSDK_FILE_PACKAGER)
+AC_SUBST(EMSCRIPTEN_EXTRA_QTLOADER_CONFIG)
 AC_SUBST(EMSCRIPTEN_EXTRA_SOFFICE_PRE_JS)
 AC_SUBST(EMSCRIPTEN_WORKERJS)
 
diff --git a/solenv/gbuild/platform/unxgcc.mk b/solenv/gbuild/platform/unxgcc.mk
index 1c289b193d4e..2bc51aa28799 100644
--- a/solenv/gbuild/platform/unxgcc.mk
+++ b/solenv/gbuild/platform/unxgcc.mk
@@ -185,7 +185,7 @@ $(if $(filter TRUE,$(ENABLE_QT5)), \
     sed -e 's/@APPNAME@/$(subst $(gb_Executable_EXT),,$(notdir $(1)))/' $(QT5_PLATFORMS_SRCDIR)/wasm_shell.html > $(dir $(1))qt_$(basename $(notdir $(1))).html && \
     cp $(QT5_PLATFORMS_SRCDIR)/qtlogo.svg $(QT5_PLATFORMS_SRCDIR)/qtloader.js $(dir $(1)) && \
 ,$(if $(filter TRUE,$(ENABLE_QT6)), \
-    sed -e 's/@APPNAME@/$(basename $(notdir $(1)))/g' -e 's/@APPEXPORTNAME@/$(basename $(notdir $(1)))_entry/g' -e 's/@PRELOAD@//g' -e 's/}$(CLOSE_PAREN);$$/}$(CLOSE_PAREN); window.Module = instance;/' $(QT6_PLATFORMS_SRCDIR)/wasm_shell.html > $(dir $(1))qt_$(basename $(notdir $(1))).html && \
+    sed -z -e 's/@APPNAME@/$(basename $(notdir $(1)))/g' -e 's/@APPEXPORTNAME@/$(basename $(notdir $(1)))_entry/g' -e 's/@PRELOAD@\n                    }/}$(COMMA)$(subst ','\'',$(EMSCRIPTEN_EXTRA_QTLOADER_CONFIG))/' -e 's/}$(CLOSE_PAREN);$$/}$(CLOSE_PAREN); window.Module = instance;/' $(QT6_PLATFORMS_SRCDIR)/wasm_shell.html > $(dir $(1))qt_$(basename $(notdir $(1))).html && \
     cp $(QT6_PLATFORMS_SRCDIR)/qtlogo.svg $(QT6_PLATFORMS_SRCDIR)/qtloader.js $(dir $(1)) && \
 )) \
     cp $(gb_CustomTarget_workdir)/static/emscripten_fs_image/soffice.data $(dir $(1))/soffice.data && \