diff --git a/source/blender/blenkernel/intern/unit.cc b/source/blender/blenkernel/intern/unit.cc
index bd872a874c3..c2e9f2d5f56 100644
--- a/source/blender/blenkernel/intern/unit.cc
+++ b/source/blender/blenkernel/intern/unit.cc
@@ -137,7 +137,7 @@ struct bUnitCollection {
 
 /* Dummy */
 static   bUnitDef buDummyDef[] = { {"", nullptr, "", nullptr, nullptr, nullptr, 1.0, 0.0}, NULL_UNIT};
-static   bUnitCollection buDummyCollection = {buDummyDef, 0, 0, sizeof(buDummyDef)};
+static   bUnitCollection buDummyCollection = {buDummyDef, 0, 0, UNIT_COLLECTION_LENGTH(buDummyDef)};
 
 
 /* Lengths. */