diff --git a/browser/app/Makefile.in b/browser/app/Makefile.in
index 7ecd49bcd94f..0b70fef33825 100644
--- a/browser/app/Makefile.in
+++ b/browser/app/Makefile.in
@@ -69,7 +69,7 @@ GRE_BUILDID = $(shell $(PYTHON) $(topsrcdir)/config/printconfigsetting.py $(LIBX
 
 DEFINES += -DGRE_MILESTONE=$(GRE_MILESTONE) -DGRE_BUILDID=$(GRE_BUILDID)
 
-SOURCE_STAMP := $(shell cd $(topsrcdir) ; hg identify 2>/dev/null | cut -f1 -d' ')
+SOURCE_STAMP := $(shell cd $(topsrcdir) ; hg identify . 2>/dev/null | cut -f1 -d' ')
 ifdef SOURCE_STAMP
 DEFINES += -DMOZ_SOURCE_STAMP="$(SOURCE_STAMP)"
 endif
diff --git a/toolkit/content/Makefile.in b/toolkit/content/Makefile.in
index afd8f7a644e3..94fdd073b3d1 100644
--- a/toolkit/content/Makefile.in
+++ b/toolkit/content/Makefile.in
@@ -58,7 +58,7 @@ DEFINES += \
   -DCPPFLAGS="$(CPPFLAGS)" \
   $(NULL)
 
-CHANGESET := $(shell cd $(topsrcdir) && hg identify 2>/dev/null | cut -f1 -d' ')
+CHANGESET := $(shell cd $(topsrcdir) && hg identify . 2>/dev/null | cut -f1 -d' ')
 ifdef CHANGESET
 DEFINES += -DSOURCE_CHANGESET="$(CHANGESET)"
 endif
diff --git a/toolkit/xre/Makefile.in b/toolkit/xre/Makefile.in
index 8a4dc37487ea..931d3c5300d4 100644
--- a/toolkit/xre/Makefile.in
+++ b/toolkit/xre/Makefile.in
@@ -220,7 +220,7 @@ DEFINES     += -DHAVE_USR_LIB64_DIR
 endif
 endif
 
-SOURCE_STAMP := $(shell cd $(topsrcdir) && hg identify 2>/dev/null | cut -f1 -d' ')
+SOURCE_STAMP := $(shell cd $(topsrcdir) && hg identify . 2>/dev/null | cut -f1 -d' ')
 # strip a trailing slash from the repo URL because it's not always present,
 # and we want to construct a working URL in buildconfig.html
 # make+shell+sed = awful