diff --git a/tests/qemu-iotests/106 b/tests/qemu-iotests/106
index 9d6adb5..ae0fc46 100755
--- a/tests/qemu-iotests/106
+++ b/tests/qemu-iotests/106
@@ -66,7 +66,7 @@
             expected_size=$((expected_size + $GROWTH_SIZE))
         fi
 
-        actual_size=$($QEMU_IMG info -f "$IMGFMT" "$TEST_IMG" | grep 'disk size')
+        actual_size=$($QEMU_IMG info -f "$IMGFMT" "$TEST_IMG" | grep 'disk size' | head -n 1)
         actual_size=$(echo "$actual_size" | sed -e 's/^[^0-9]*\([0-9]\+\).*$/\1/')
 
         # The actual size may exceed the expected size, depending on the file
@@ -105,7 +105,7 @@
     _make_test_img -o "extent_size_hint=0" 2G
     $QEMU_IMG resize -f "$IMGFMT" --preallocation=$growth_mode "$TEST_IMG" +${GROWTH_SIZE}K
 
-    actual_size=$($QEMU_IMG info -f "$IMGFMT" "$TEST_IMG" | grep 'disk size')
+    actual_size=$($QEMU_IMG info -f "$IMGFMT" "$TEST_IMG" | grep 'disk size' | head -n 1)
     actual_size=$(echo "$actual_size" | sed -e 's/^[^0-9]*\([0-9]\+\).*$/\1/')
 
     if [ $actual_size -lt $GROWTH_SIZE ]; then
diff --git a/tests/qemu-iotests/214 b/tests/qemu-iotests/214
index c66e246..55ffcd7 100755
--- a/tests/qemu-iotests/214
+++ b/tests/qemu-iotests/214
@@ -102,7 +102,8 @@
 $QEMU_IO -c "write -P 0xaa 0 $data_size" "$TEST_IMG" \
          2>&1 | _filter_qemu_io | _filter_testdir
 sizeA=$($QEMU_IMG info --output=json "$TEST_IMG" |
-        sed -n '/"actual-size":/ s/[^0-9]//gp')
+        sed -n '/"actual-size":/ s/[^0-9]//gp' |
+        head -n 1)
 
 _make_test_img 2M -o cluster_size=$cluster_size
 echo "Write compressed data:"
@@ -124,7 +125,8 @@
                           _filter_qemu_io | _filter_testdir
 
 sizeB=$($QEMU_IMG info --output=json "$TEST_IMG" |
-        sed -n '/"actual-size":/ s/[^0-9]//gp')
+        sed -n '/"actual-size":/ s/[^0-9]//gp' |
+        head -n 1)
 
 if [ $sizeA -lt $sizeB ]
 then
diff --git a/tests/qemu-iotests/308 b/tests/qemu-iotests/308
index bde4aac..09275e9 100755
--- a/tests/qemu-iotests/308
+++ b/tests/qemu-iotests/308
@@ -217,12 +217,12 @@
 echo '=== Remove export ==='
 
 # Double-check that $EXT_MP appears as a non-empty file (the raw image)
-$QEMU_IMG info -f raw "$EXT_MP" | grep 'virtual size'
+$QEMU_IMG info -f raw "$EXT_MP" | grep 'virtual size' | head -n 1
 
 fuse_export_del 'export-mp'
 
 # See that the file appears empty again
-$QEMU_IMG info -f raw "$EXT_MP" | grep 'virtual size'
+$QEMU_IMG info -f raw "$EXT_MP" | grep 'virtual size' | head -n 1
 
 echo
 echo '=== Writable export ==='