diff --git a/tests/qemu-iotests/178 b/tests/qemu-iotests/178
index 3b1a7adce4..8df241ead8 100755
--- a/tests/qemu-iotests/178
+++ b/tests/qemu-iotests/178
@@ -57,7 +57,7 @@ $QEMU_IMG measure --image-opts # missing filename
 $QEMU_IMG measure -f qcow2 # missing filename
 $QEMU_IMG measure -l snap1 # missing filename
 $QEMU_IMG measure -o , # invalid option list
-$QEMU_IMG measure -l snapshot.foo # invalid snapshot option
+$QEMU_IMG measure -l snapshot.foo=bar # invalid snapshot option
 $QEMU_IMG measure --output foo # invalid output format
 $QEMU_IMG measure --size -1 # invalid image size
 $QEMU_IMG measure -O foo "$TEST_IMG" # unknown image file format
diff --git a/tests/qemu-iotests/178.out.qcow2 b/tests/qemu-iotests/178.out.qcow2
index c7997760fd..fe193fd5f4 100644
--- a/tests/qemu-iotests/178.out.qcow2
+++ b/tests/qemu-iotests/178.out.qcow2
@@ -11,7 +11,7 @@ qemu-img: --image-opts, -f, and -l require a filename argument.
 qemu-img: --image-opts, -f, and -l require a filename argument.
 qemu-img: Invalid option list: ,
 qemu-img: Invalid parameter 'snapshot.foo'
-qemu-img: Failed in parsing snapshot param 'snapshot.foo'
+qemu-img: Failed in parsing snapshot param 'snapshot.foo=bar'
 qemu-img: --output must be used with human or json as argument.
 qemu-img: Invalid image size specified. Must be between 0 and 9223372036854775807.
 qemu-img: Unknown file format 'foo'
diff --git a/tests/qemu-iotests/178.out.raw b/tests/qemu-iotests/178.out.raw
index 20e17da115..445e460fad 100644
--- a/tests/qemu-iotests/178.out.raw
+++ b/tests/qemu-iotests/178.out.raw
@@ -11,7 +11,7 @@ qemu-img: --image-opts, -f, and -l require a filename argument.
 qemu-img: --image-opts, -f, and -l require a filename argument.
 qemu-img: Invalid option list: ,
 qemu-img: Invalid parameter 'snapshot.foo'
-qemu-img: Failed in parsing snapshot param 'snapshot.foo'
+qemu-img: Failed in parsing snapshot param 'snapshot.foo=bar'
 qemu-img: --output must be used with human or json as argument.
 qemu-img: Invalid image size specified. Must be between 0 and 9223372036854775807.
 qemu-img: Unknown file format 'foo'