diff --git a/app/mac/build-and-unify b/app/mac/build-and-unify
index 09861b11fc..b3c8581557 100755
--- a/app/mac/build-and-unify
+++ b/app/mac/build-and-unify
@@ -9,7 +9,7 @@ fx_app_name=Firefox.app
 
 # Get Mozilla source directory from command line
 if [ -z "${1:-}" ]; then
-	echo "Usage: $0 /path/to/mozilla-unified" >&2
+	echo "Usage: $0 /path/to/firefox" >&2
 	exit 1
 fi
 GECKO_PATH=$1
diff --git a/app/win/build b/app/win/build
index 8fa946474c..e678c254a8 100644
--- a/app/win/build
+++ b/app/win/build
@@ -10,7 +10,7 @@ if [ -z "${1:-}" ]; then
 	exit 1
 fi
 
-gecko_path=/c/mozilla-source/mozilla-unified
+gecko_path=/c/mozilla-source/firefox
 arch=$1
 
 if [ ! -d "$gecko_path" ]; then