diff --git a/tools/test-case-generators/distro-arch-imagetype-map.json b/tools/test-case-generators/distro-arch-imagetype-map.json
index 1e7ff2a86..2a4b8abe6 100644
--- a/tools/test-case-generators/distro-arch-imagetype-map.json
+++ b/tools/test-case-generators/distro-arch-imagetype-map.json
@@ -88,7 +88,7 @@
             "qcow2",
             "edge-commit",
             "edge-container",
-            "image_installer",
+            "image-installer",
             "vhd",
             "vmdk"
         ],
@@ -121,7 +121,7 @@
             "qcow2",
             "edge-commit",
             "edge-container",
-            "image_installer",
+            "image-installer",
             "vhd",
             "vmdk"
         ],