diff --git a/build/Makefile.in b/build/Makefile.in
index 5247126f974..a08952bccf7 100644
--- a/build/Makefile.in
+++ b/build/Makefile.in
@@ -74,7 +74,7 @@ _LEAKTEST_DIR = $(DEPTH)/_leaktest
 
 _LEAKTEST_FILES =    \
 		automation.py \
-		automationutils.py \
+		$(CURDIR)/automationutils.py \
 		leaktest.py \
 		bloatcycle.html \
 		$(topsrcdir)/build/pgo/server-locations.txt \
diff --git a/build/automation-build.mk b/build/automation-build.mk
index 15753d71b29..111971b46f2 100644
--- a/build/automation-build.mk
+++ b/build/automation-build.mk
@@ -71,4 +71,4 @@ automation.py: $(topsrcdir)/build/automation.py.in $(topsrcdir)/build/automation
 	$(PYTHON) $(topsrcdir)/config/Preprocessor.py \
 	$(AUTOMATION_PPARGS) $(DEFINES) $(ACDEFINES) $< > $@
 
-GARBAGE += automation.py automationutils.py
+GARBAGE += automation.py $(CURDIR)/automationutils.py
diff --git a/build/pgo/Makefile.in b/build/pgo/Makefile.in
index efd109173e1..20aa21a8dcd 100644
--- a/build/pgo/Makefile.in
+++ b/build/pgo/Makefile.in
@@ -59,7 +59,7 @@ include $(topsrcdir)/build/automation-build.mk
 
 _PGO_FILES = 	\
   automation.py \
-  automationutils.py \
+  $(CURDIR)/automationutils.py \
   profileserver.py \
   genpgocert.py \
   index.html \
diff --git a/layout/tools/reftest/Makefile.in b/layout/tools/reftest/Makefile.in
index 505bf7c3946..4194d18d34c 100644
--- a/layout/tools/reftest/Makefile.in
+++ b/layout/tools/reftest/Makefile.in
@@ -75,7 +75,7 @@ endif
 _HARNESS_FILES = \
   $(srcdir)/runreftest.py \
   automation.py \
-  automationutils.py \
+  $(CURDIR)/automationutils.py \
   $(NULL)
 
 $(_DEST_DIR):
diff --git a/testing/mochitest/Makefile.in b/testing/mochitest/Makefile.in
index 5ad32aca73c..1c83ead66d6 100644
--- a/testing/mochitest/Makefile.in
+++ b/testing/mochitest/Makefile.in
@@ -60,7 +60,7 @@ include $(topsrcdir)/build/automation-build.mk
 _SERV_FILES = 	\
 		runtests.py \
 		automation.py \
-		automationutils.py \
+		$(CURDIR)/automationutils.py \
 		gen_template.pl \
 		server.js \
 		harness-a11y.xul \