diff --git a/indra/cmake/Copy3rdPartyLibs.cmake b/indra/cmake/Copy3rdPartyLibs.cmake
index ff705101ded51485ee120cc69017823871d68899..439bec865cc7dee38ab8a9193c183fbadb4ae5a1 100644
--- a/indra/cmake/Copy3rdPartyLibs.cmake
+++ b/indra/cmake/Copy3rdPartyLibs.cmake
@@ -61,6 +61,15 @@ if(WINDOWS)
         uriparser.dll
         )
 
+    # ICU4C (same filenames for 32 and 64 bit builds)
+    set(release_files ${release_files} icudt48.dll)
+    set(release_files ${release_files} icuin48.dll)
+    set(release_files ${release_files} icuio48.dll)
+    set(release_files ${release_files} icule48.dll)
+    set(release_files ${release_files} iculx48.dll)
+    set(release_files ${release_files} icutu48.dll)
+    set(release_files ${release_files} icuuc48.dll)
+
     # OpenSSL
     if(ADDRESS_SIZE EQUAL 64)
         set(release_files ${release_files} libcrypto-1_1-x64.dll)
diff --git a/indra/newview/viewer_manifest.py b/indra/newview/viewer_manifest.py
index 8cc1cc5bb4483370d64e5f3081225c25179d9dec..26983bbba82065d52fe691ca399bd05371757b7d 100755
--- a/indra/newview/viewer_manifest.py
+++ b/indra/newview/viewer_manifest.py
@@ -517,6 +517,16 @@ def construct(self):
                 self.path("OpenAL32.dll")
                 self.path("alut.dll")
 
+            # For ICU4C
+            self.path("")
+            self.path("icudt48.dll")
+            self.path("icuin48.dll")
+            self.path("icuio48.dll")
+            self.path("icule48.dll")
+            self.path("iculx48.dll")
+            self.path("icutu48.dll")
+            self.path("icuuc48.dll")
+
             # For textures
             self.path("openjpeg.dll")