diff --git a/ccd_defs.json b/ccd_defs.json
index 163b504b..ce3dbd94 100644
--- a/ccd_defs.json
+++ b/ccd_defs.json
@@ -236,6 +236,7 @@
   "OLYMPUS OPTICAL CO.,LTD X-2,C-50Z": 7.176,
   "OLYMPUS SP550UZ": 5.76,
   "OLYMPUS X100,D540Z,C310Z": 5.27,
+  "Panasonic DMC-GH4": 17.3,
   "Panasonic DMC-FX01": 5.76,
   "Panasonic DMC-FX07": 5.75,
   "Panasonic DMC-FX9": 5.76,