diff --git a/browser/app/Makefile.in b/browser/app/Makefile.in
index 096c6c4060e3..71c0876365f7 100644
--- a/browser/app/Makefile.in
+++ b/browser/app/Makefile.in
@@ -66,7 +66,7 @@ DIST_FILES = application.ini
 
 # GRE_BUILD_ID is only available in nsBuildID.h in a form that we can't use
 # directly. So munge it. Beware makefile and shell escaping
-AWK_EXPR = '/\#define GRE_BUILD_ID/ { print gensub(/"/, "", "g", $$3) }'
+AWK_EXPR = '/\#define GRE_BUILD_ID/ { gsub(/"/, "", "g", $$3); print $$3 }'
 AWK_CMD = awk $(AWK_EXPR) < $(DEPTH)/config/nsBuildID.h
 
 GRE_BUILD_ID = $(shell $(AWK_CMD))