diff --git a/dom/bindings/Makefile.in b/dom/bindings/Makefile.in
index b304623b8b05..84518efde85f 100644
--- a/dom/bindings/Makefile.in
+++ b/dom/bindings/Makefile.in
@@ -6,6 +6,15 @@ webidl_base := $(topsrcdir)/dom/webidl
 
 ifdef COMPILE_ENVIRONMENT
 
+# Akin to GLOBAL_DEPS, but set early enough that webidlsrcs.mk
+# can make use of them as dependencies.
+WEBIDL_PP_DEPS := \
+    backend.mk \
+    Makefile \
+    $(DEPTH)/config/autoconf.mk \
+    $(topsrcdir)/config/config.mk \
+    $(NULL)
+
 # Generated by moz.build
 include webidlsrcs.mk
 
diff --git a/python/mozbuild/mozbuild/backend/recursivemake.py b/python/mozbuild/mozbuild/backend/recursivemake.py
index 22c5c46d185e..1c8574104af3 100644
--- a/python/mozbuild/mozbuild/backend/recursivemake.py
+++ b/python/mozbuild/mozbuild/backend/recursivemake.py
@@ -1782,7 +1782,10 @@ class RecursiveMakeBackend(CommonBackend):
         for source in sorted(webidls.all_preprocessed_sources()):
             basename = os.path.basename(source)
             rule = mk.create_rule([basename])
-            rule.add_dependencies([source, '$(GLOBAL_DEPS)'])
+            # GLOBAL_DEPS would be used here, but due to the include order of
+            # our makefiles it's not set early enough to be useful, so we use
+            # WEBIDL_PP_DEPS, which has analagous content.
+            rule.add_dependencies([source, '$(WEBIDL_PP_DEPS)'])
             rule.add_commands([
                 # Remove the file before writing so bindings that go from
                 # static to preprocessed don't end up writing to a symlink,