diff --git a/CHANGELOG.md b/CHANGELOG.md
index 47e5bb485..d84a661ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -154,6 +154,7 @@
     Bug #5168: Force1stPerson and Force3rdPerson commands are not really force view change
     Bug #5169: Nested levelled items/creatures have significantly higher chance not to spawn
     Bug #5175: Random script function returns an integer value
+    Bug #5177: Editor: Unexplored map tiles get corrupted after a file with terrain is saved
     Feature #1774: Handle AvoidNode
     Feature #2229: Improve pathfinding AI
     Feature #3025: Analogue gamepad movement controls
diff --git a/CHANGELOG_PR.md b/CHANGELOG_PR.md
index afd2dafcc..3062cc9d2 100644
--- a/CHANGELOG_PR.md
+++ b/CHANGELOG_PR.md
@@ -102,6 +102,7 @@ Editor Bug Fixes:
 - Cloned, added, or moved instances no longer disappear at load-time (#4748)
 - "Clear" function in the content selector no longer tries to execute a "Remove" action on an empty file list (#4757)
 - Engine no longer tries to swap buffers of windows which weren't exposed to Qt's window management system (#4911)
+- Minimap doesn't get corrupted, when editing new omwgame (#5177)
 
 Miscellaneous:
 - Upgraded to FFMPEG3 for media decoding (#4686)
diff --git a/components/esm/loadland.cpp b/components/esm/loadland.cpp
index 722154757..c52483681 100644
--- a/components/esm/loadland.cpp
+++ b/components/esm/loadland.cpp
@@ -323,7 +323,9 @@ namespace ESM
     : mFlags (land.mFlags), mX (land.mX), mY (land.mY), mPlugin (land.mPlugin),
       mContext (land.mContext), mDataTypes (land.mDataTypes),
       mLandData (land.mLandData ? new LandData (*land.mLandData) : 0)
-    {}
+    {
+        std::copy(land.mWnam, land.mWnam + LAND_GLOBAL_MAP_LOD_SIZE, mWnam);
+    }
 
     Land& Land::operator= (Land land)
     {
@@ -340,6 +342,7 @@ namespace ESM
         std::swap (mContext, land.mContext);
         std::swap (mDataTypes, land.mDataTypes);
         std::swap (mLandData, land.mLandData);
+        std::swap (mWnam, land.mWnam);
     }
 
     const Land::LandData *Land::getLandData (int flags) const