diff --git a/config/makefiles/xpcshell.mk b/config/makefiles/xpcshell.mk
index 63604726781e..ea080e00c911 100644
--- a/config/makefiles/xpcshell.mk
+++ b/config/makefiles/xpcshell.mk
@@ -58,6 +58,7 @@ xpcshell-tests-remote:
 	$(PYTHON) -u $(topsrcdir)/config/pythonpath.py \
 	  -I$(topsrcdir)/build \
 	  -I$(topsrcdir)/build/mobile \
+	  -I$(topsrcdir)/testing/mozbase/mozdevice/mozdevice \
 	  $(topsrcdir)/testing/xpcshell/remotexpcshelltests.py \
 	  --symbols-path=$(DIST)/crashreporter-symbols \
 	  --build-info-json=$(DEPTH)/mozinfo.json \
diff --git a/js/src/config/makefiles/xpcshell.mk b/js/src/config/makefiles/xpcshell.mk
index 63604726781e..ea080e00c911 100644
--- a/js/src/config/makefiles/xpcshell.mk
+++ b/js/src/config/makefiles/xpcshell.mk
@@ -58,6 +58,7 @@ xpcshell-tests-remote:
 	$(PYTHON) -u $(topsrcdir)/config/pythonpath.py \
 	  -I$(topsrcdir)/build \
 	  -I$(topsrcdir)/build/mobile \
+	  -I$(topsrcdir)/testing/mozbase/mozdevice/mozdevice \
 	  $(topsrcdir)/testing/xpcshell/remotexpcshelltests.py \
 	  --symbols-path=$(DIST)/crashreporter-symbols \
 	  --build-info-json=$(DEPTH)/mozinfo.json \
diff --git a/testing/testsuite-targets.mk b/testing/testsuite-targets.mk
index 3804de883794..f70673d3e17d 100644
--- a/testing/testsuite-targets.mk
+++ b/testing/testsuite-targets.mk
@@ -265,6 +265,7 @@ REMOTE_XPCSHELL = \
 	$(PYTHON) -u $(topsrcdir)/config/pythonpath.py \
 	  -I$(topsrcdir)/build \
 	  -I$(topsrcdir)/build/mobile \
+	  -I$(topsrcdir)/testing/mozbase/mozdevice/mozdevice \
 	  $(topsrcdir)/testing/xpcshell/remotexpcshelltests.py \
 	  --manifest=$(DEPTH)/_tests/xpcshell/xpcshell.ini \
 	  --build-info-json=$(DEPTH)/mozinfo.json \