diff --git a/pkgs/applications/science/misc/root/default.nix b/pkgs/applications/science/misc/root/default.nix
index a736bdad2ea..808af776e28 100644
--- a/pkgs/applications/science/misc/root/default.nix
+++ b/pkgs/applications/science/misc/root/default.nix
@@ -63,6 +63,8 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
+  setupHook = ./setup-hook.sh;
+
   meta = {
     homepage = "https://root.cern.ch/";
     description = "A data analysis framework";
diff --git a/pkgs/applications/science/misc/root/setup-hook.sh b/pkgs/applications/science/misc/root/setup-hook.sh
new file mode 100644
index 00000000000..197dc78c3c2
--- /dev/null
+++ b/pkgs/applications/science/misc/root/setup-hook.sh
@@ -0,0 +1,9 @@
+thisroot () {
+    # Workaround thisroot.sh dependency on man
+    if [ -z "${MANPATH}" ]; then
+        MANPATH=:
+    fi
+    source @out@/bin/thisroot.sh
+}
+
+envHooks+=(thisroot)