diff --git a/tests/common b/tests/common
index e653d4c6..5430f822 100644
--- a/tests/common
+++ b/tests/common
@@ -202,6 +202,10 @@ check_all_images()
 	local extracted
 
 	dir="$1"
+	if [ -z "$dir" ]; then
+		dir=.
+	fi
+	_assert_path "$dir"
 	for image in $(find "$dir" \( -iname '*.img' -o	\
 				-iname '*.img.xz' -o 	\
 				-iname '*.raw' -o 	\
diff --git a/tests/fsck-tests.sh b/tests/fsck-tests.sh
index d5fc3d14..44cca1b8 100755
--- a/tests/fsck-tests.sh
+++ b/tests/fsck-tests.sh
@@ -43,7 +43,7 @@ run_one_test() {
 		fi
 	else
 		# Type 1
-		check_all_images `pwd`
+		check_all_images
 	fi
 	cd "$TOP"
 }
diff --git a/tests/fsck-tests/022-qgroup-rescan-halfway/test.sh b/tests/fsck-tests/022-qgroup-rescan-halfway/test.sh
index 5b114eeb..1dc8f8fc 100755
--- a/tests/fsck-tests/022-qgroup-rescan-halfway/test.sh
+++ b/tests/fsck-tests/022-qgroup-rescan-halfway/test.sh
@@ -16,4 +16,4 @@ check_image() {
 	fi
 }
 
-check_all_images "."
+check_all_images
diff --git a/tests/fsck-tests/023-qgroup-stack-overflow/test.sh b/tests/fsck-tests/023-qgroup-stack-overflow/test.sh
index e8bf3fae..a304eac5 100755
--- a/tests/fsck-tests/023-qgroup-stack-overflow/test.sh
+++ b/tests/fsck-tests/023-qgroup-stack-overflow/test.sh
@@ -14,4 +14,4 @@ check_image()
 	run_check $TOP/btrfs check "$1"
 }
 
-check_all_images "."
+check_all_images