diff --git a/pkgs/os-specific/linux/kernel/linux-rt-5.10.nix b/pkgs/os-specific/linux/kernel/linux-rt-5.10.nix
index 6bc23341acad..08cc4cfce3cb 100644
--- a/pkgs/os-specific/linux/kernel/linux-rt-5.10.nix
+++ b/pkgs/os-specific/linux/kernel/linux-rt-5.10.nix
@@ -40,6 +40,7 @@ buildLinux (
       in
       [ rt-patch ] ++ kernelPatches;
 
+    isLTS = true;
     structuredExtraConfig =
       with lib.kernel;
       {
diff --git a/pkgs/os-specific/linux/kernel/linux-rt-5.15.nix b/pkgs/os-specific/linux/kernel/linux-rt-5.15.nix
index 0db95f0059c7..49c0f89f8a2b 100644
--- a/pkgs/os-specific/linux/kernel/linux-rt-5.15.nix
+++ b/pkgs/os-specific/linux/kernel/linux-rt-5.15.nix
@@ -57,6 +57,8 @@ buildLinux (
       }
       // structuredExtraConfig;
 
+    isLTS = true;
+
     extraMeta = extraMeta // {
       inherit branch;
     };
diff --git a/pkgs/os-specific/linux/kernel/linux-rt-5.4.nix b/pkgs/os-specific/linux/kernel/linux-rt-5.4.nix
index a621d24576fd..5c95493379da 100644
--- a/pkgs/os-specific/linux/kernel/linux-rt-5.4.nix
+++ b/pkgs/os-specific/linux/kernel/linux-rt-5.4.nix
@@ -50,6 +50,8 @@ buildLinux (
       }
       // structuredExtraConfig;
 
+    isLTS = true;
+
     extraMeta = extraMeta // {
       inherit branch;
     };
diff --git a/pkgs/os-specific/linux/kernel/linux-rt-6.1.nix b/pkgs/os-specific/linux/kernel/linux-rt-6.1.nix
index 6c6459e8b14e..f27de5421729 100644
--- a/pkgs/os-specific/linux/kernel/linux-rt-6.1.nix
+++ b/pkgs/os-specific/linux/kernel/linux-rt-6.1.nix
@@ -60,6 +60,8 @@ buildLinux (
     extraMeta = extraMeta // {
       inherit branch;
     };
+
+    isLTS = true;
   }
   // argsOverride
 )
diff --git a/pkgs/os-specific/linux/kernel/linux-rt-6.6.nix b/pkgs/os-specific/linux/kernel/linux-rt-6.6.nix
index 5a877d6c32fb..037fb34519e1 100644
--- a/pkgs/os-specific/linux/kernel/linux-rt-6.6.nix
+++ b/pkgs/os-specific/linux/kernel/linux-rt-6.6.nix
@@ -60,6 +60,8 @@ buildLinux (
     extraMeta = extraMeta // {
       inherit branch;
     };
+
+    isLTS = true;
   }
   // argsOverride
 )