diff --git a/pkgs/development/libraries/qt-5/5.15/fetch.sh b/pkgs/development/libraries/qt-5/5.15/fetch.sh
index dcada3649078..7225b432c574 100755
--- a/pkgs/development/libraries/qt-5/5.15/fetch.sh
+++ b/pkgs/development/libraries/qt-5/5.15/fetch.sh
@@ -10,7 +10,7 @@ srcs="${here}/srcs-generated.json"
 while read -r module; do
     if [[ -z "$module" ]]; then continue; fi
     url="https://invent.kde.org/qt/qt/${module}.git"
-    nix-prefetch-git --url $url --rev refs/heads/kde/5.15 \
+    nix-prefetch-git --url $url --rev refs/heads/kde/5.15 --fetch-submodules \
         | jq "{key: \"${module}\", value: {url,rev,sha256}}"
 done < "$modules" | jq -s 'from_entries' > "${srcs}.tmp"
 
diff --git a/pkgs/development/libraries/qt-5/5.15/srcs.nix b/pkgs/development/libraries/qt-5/5.15/srcs.nix
index 36cab60e97b4..19f36c337e5c 100644
--- a/pkgs/development/libraries/qt-5/5.15/srcs.nix
+++ b/pkgs/development/libraries/qt-5/5.15/srcs.nix
@@ -14,7 +14,7 @@ let
         fetchgit {
           inherit (args) url rev sha256;
           fetchLFS = false;
-          fetchSubmodules = false;
+          fetchSubmodules = true;
           deepClone = false;
           leaveDotGit = false;
         };