--- a/configure.in
+++ b/configure.in
@@ -4149,17 +4149,16 @@ cairo-gtk3)
     MOZ_ENABLE_XREMOTE=1
     MOZ_GL_DEFAULT_PROVIDER=GLX
 
     AC_DEFINE(MOZ_X11)
     MOZ_X11=1
     USE_FC_FREETYPE=1
 
     TK_CFLAGS='$(MOZ_GTK3_CFLAGS)'
-    TK_LIBS='$(MOZ_GTK3_LIBS)'
     MOZ_WIDGET_GTK=3
     AC_DEFINE_UNQUOTED(MOZ_WIDGET_GTK,$MOZ_WIDGET_GTK)
     MOZ_PDF_PRINTING=1
     MOZ_INSTRUMENT_EVENT_LOOP=1
     ;;
 
 cairo-gtk2|cairo-gtk2-x11)
     MOZ_WIDGET_TOOLKIT=gtk2
@@ -4262,16 +4261,20 @@ fi
 if test "$MOZ_INSTRUMENT_EVENT_LOOP"; then
    AC_DEFINE(MOZ_INSTRUMENT_EVENT_LOOP)
 fi
 
 if test "$COMPILE_ENVIRONMENT"; then
   if test "$MOZ_ENABLE_GTK3"; then
     PKG_CHECK_MODULES(MOZ_GTK3, gtk+-3.0 >= $GTK3_VERSION gtk+-unix-print-3.0 glib-2.0 gobject-2.0 $GDK_PACKAGES)
     MOZ_GTK3_CFLAGS="-I${_topsrcdir}/widget/gtk/compat-gtk3 $MOZ_GTK3_CFLAGS"
+    dnl Contrary to MOZ_GTK2_LIBS, MOZ_GTK3_LIBS needs to be literally added to TK_LIBS instead
+    dnl of a make reference because of how TK_LIBS is mangled in toolkit/library/moz.build
+    dnl for GTK+3 builds.
+    TK_LIBS=$MOZ_GTK3_LIBS
   fi
   if test "$MOZ_ENABLE_GTK"; then
     if test "$MOZ_X11"; then
       GDK_PACKAGES=gdk-x11-2.0
     fi
 
     PKG_CHECK_MODULES(MOZ_GTK2, gtk+-2.0 >= $GTK2_VERSION gtk+-unix-print-2.0 glib-2.0 gobject-2.0 $GDK_PACKAGES)
     MOZ_GTK2_CFLAGS="-I${_topsrcdir}/widget/gtk/compat $MOZ_GTK2_CFLAGS"