diff --git a/aligenmc b/aligenmc
index 00f4d71..0937181 100755
--- a/aligenmc
+++ b/aligenmc
@@ -68,6 +68,7 @@ par_k() {
 
 par_K() {
     help "set ktmax"
+    setvar KTMAX
 }
 
 # initialisation
diff --git a/gen/herwig/gen.sh b/gen/herwig/gen.sh
index dbef7cc..5bf3deb 100644
--- a/gen/herwig/gen.sh
+++ b/gen/herwig/gen.sh
@@ -24,7 +24,7 @@ gen_herwig(){
             run_in_env 'Herwig --repo=${HERWIG_ROOT}/share/Herwig/HerwigDefaults.rpo read herwig.in' > setup.log
         fi
 
-        run_in_env 'Herwig --repo=${HERWIG_ROOT}/share/Herwig/HerwigDefaults.rpo run herwig.run -N ${NEV} --seed ${SEED}' > hwgen.log
+        run_in_env 'Herwig --repo=${HERWIG_ROOT}/share/Herwig/HerwigDefaults.rpo run herwig.run -N ${NEV} --seed=${SEED}' > hwgen.log
         ;;
     *)
         help "Herwig 7"
diff --git a/gen/herwig/generate_hwgin.py b/gen/herwig/generate_hwgin.py
index 5996e72..b97e37d 100644
--- a/gen/herwig/generate_hwgin.py
+++ b/gen/herwig/generate_hwgin.py
@@ -112,10 +112,10 @@ def GenerateHerwigInput(outputfile, tune, cmsenegy, events, hepmcfile, ktmin, kt
         # - Omega (3334)
         # Also set corresponding antiparticles to stable
         stableparticles = ["K0", "Kbar0", "Lambda0", "Lambdabar0", "Sigma0", "Sigmabar0", 
-                           "Sigma+", "Sigmabar-", "Sigma-", "Sigmabar+", "Xi0", "Xibar0" 
+                           "Sigma+", "Sigmabar-", "Sigma-", "Sigmabar+", "Xi0", "Xibar0", 
                            "Xi-", "Xibar+", "Omega-", "Omegabar+"]
         for particle in stableparticles:
-            myfile.write("set /Herwig/Particle/{}:Stable Stable".format(particle))
+            myfile.write("set /Herwig/Particles/{}:Stable Stable\n".format(particle))
 
         # In addition: stable particles with a lifetime > 10 mm (decay externally)
         myfile.write("set /Herwig/Decays/DecayHandler:MaxLifeTime 10*mm\n")
diff --git a/lib/tools.sh b/lib/tools.sh
index b3b7ce9..35c5cac 100644
--- a/lib/tools.sh
+++ b/lib/tools.sh
@@ -27,6 +27,6 @@ run_in_env() {
         fi
 #	    alienv setenv ${GEN_PACKAGES} -c "$*"
     else
-	    /bin/bash -c "$*"
+	    (eval $*)
     fi
 }