diff --git a/pkgs/applications/networking/instant-messengers/discord/linux.nix b/pkgs/applications/networking/instant-messengers/discord/linux.nix
index ef77a66f3bb4..bf94609409a8 100644
--- a/pkgs/applications/networking/instant-messengers/discord/linux.nix
+++ b/pkgs/applications/networking/instant-messengers/discord/linux.nix
@@ -173,7 +173,10 @@ stdenv.mkDerivation rec {
     wrapProgramShell $out/opt/${binaryName}/${binaryName} \
         "''${gappsWrapperArgs[@]}" \
         --add-flags "\''${NIXOS_OZONE_WL:+\''${WAYLAND_DISPLAY:+--ozone-platform=wayland --enable-features=WaylandWindowDecorations --enable-wayland-ime=true}}" \
-        ${lib.strings.optionalString withTTS "--add-flags \"--enable-speech-dispatcher\""} \
+        ${lib.strings.optionalString withTTS ''
+          --run 'if [[ "''${NIXOS_SPEECH:-default}" != "False" ]]; then NIXOS_SPEECH=True; else unset NIXOS_SPEECH; fi' \
+          --add-flags "\''${NIXOS_SPEECH:+--enable-speech-dispatcher}" \
+        ''} \
         ${lib.strings.optionalString enableAutoscroll "--add-flags \"--enable-blink-features=MiddleClickAutoscroll\""} \
         --prefix XDG_DATA_DIRS : "${gtk3}/share/gsettings-schemas/${gtk3.name}/" \
         --prefix LD_LIBRARY_PATH : ${libPath}:$out/opt/${binaryName} \
diff --git a/pkgs/by-name/ve/vesktop/package.nix b/pkgs/by-name/ve/vesktop/package.nix
index 9ceee9d8fff6..2a78c7be03b1 100644
--- a/pkgs/by-name/ve/vesktop/package.nix
+++ b/pkgs/by-name/ve/vesktop/package.nix
@@ -139,7 +139,10 @@ stdenv.mkDerivation (finalAttrs: {
     lib.optionalString stdenv.hostPlatform.isLinux ''
       makeWrapper ${electron}/bin/electron $out/bin/vesktop \
         --add-flags $out/opt/Vesktop/resources/app.asar \
-        ${lib.optionalString withTTS "--add-flags \"--enable-speech-dispatcher\""} \
+        ${lib.strings.optionalString withTTS ''
+          --run 'if [[ "''${NIXOS_SPEECH:-default}" != "False" ]]; then NIXOS_SPEECH=True; else unset NIXOS_SPEECH; fi' \
+          --add-flags "\''${NIXOS_SPEECH:+--enable-speech-dispatcher}" \
+        ''} \
         ${lib.optionalString withMiddleClickScroll "--add-flags \"--enable-blink-features=MiddleClickAutoscroll\""} \
         --add-flags "\''${NIXOS_OZONE_WL:+\''${WAYLAND_DISPLAY:+--ozone-platform-hint=auto --enable-features=WaylandWindowDecorations --enable-wayland-ime=true}}"
     ''