diff --git a/pkgs/os-specific/bsd/freebsd/default.nix b/pkgs/os-specific/bsd/freebsd/default.nix
index c605d9f70937..e56c70c1d32d 100644
--- a/pkgs/os-specific/bsd/freebsd/default.nix
+++ b/pkgs/os-specific/bsd/freebsd/default.nix
@@ -52,7 +52,7 @@ let
             sourceData = versions.${self.branch} or (throw (badBranchError self.branch));
             versionData = self.sourceData.version;
             buildFreebsd = otherSplices.selfBuildHost;
-            patchesRoot = ./patches/${self.versionData.revision};
+            patchesRoot = ./patches + "/${self.versionData.revision}";
           }
           // extraArgs
         ) self;
diff --git a/pkgs/os-specific/bsd/freebsd/package-set.nix b/pkgs/os-specific/bsd/freebsd/package-set.nix
index dfde4a0a31fa..4ff6cb210249 100644
--- a/pkgs/os-specific/bsd/freebsd/package-set.nix
+++ b/pkgs/os-specific/bsd/freebsd/package-set.nix
@@ -17,7 +17,7 @@ lib.packagesFromDirectoryRecursive {
 }
 // {
   inherit sourceData patchesRoot versionData;
-  patches = ./patches/${self.versionData.revision};
+  patches = ./patches + "/${self.versionData.revision}";
 
   # Keep the crawled portion of Nixpkgs finite.
   buildFreebsd = lib.dontRecurseIntoAttrs buildFreebsd;