diff --git a/pkgs/by-name/ci/ciscoPacketTracer7/package.nix b/pkgs/by-name/ci/ciscoPacketTracer7/package.nix
index 2dc1b9a5d31c..fb62731ce965 100644
--- a/pkgs/by-name/ci/ciscoPacketTracer7/package.nix
+++ b/pkgs/by-name/ci/ciscoPacketTracer7/package.nix
@@ -85,6 +85,7 @@ let
       runHook preInstall
 
       makeWrapper "$out/opt/pt/bin/PacketTracer7" "$out/bin/packettracer7" \
+        --set QT_QPA_PLATFORM xcb \
         --prefix LD_LIBRARY_PATH : "$out/opt/pt/bin"
 
       runHook postInstall
diff --git a/pkgs/by-name/ci/ciscoPacketTracer8/package.nix b/pkgs/by-name/ci/ciscoPacketTracer8/package.nix
index 3a86c98ae9cf..848b807e6321 100644
--- a/pkgs/by-name/ci/ciscoPacketTracer8/package.nix
+++ b/pkgs/by-name/ci/ciscoPacketTracer8/package.nix
@@ -111,6 +111,7 @@ let
       runHook preInstall
 
       makeWrapper "$out/opt/pt/bin/PacketTracer" "$out/bin/packettracer8" \
+        --set QT_QPA_PLATFORM xcb \
         --prefix LD_LIBRARY_PATH : "$out/opt/pt/bin"
 
       runHook postInstall