diff --git a/tools/msi2lmp/test/crambin.car b/tools/msi2lmp/test/crambin-class1.car
similarity index 100%
rename from tools/msi2lmp/test/crambin.car
rename to tools/msi2lmp/test/crambin-class1.car
diff --git a/tools/msi2lmp/test/crambin.mdf b/tools/msi2lmp/test/crambin-class1.mdf
similarity index 100%
rename from tools/msi2lmp/test/crambin.mdf
rename to tools/msi2lmp/test/crambin-class1.mdf
diff --git a/tools/msi2lmp/test/nylon.car b/tools/msi2lmp/test/nylon-class1.car
similarity index 100%
rename from tools/msi2lmp/test/nylon.car
rename to tools/msi2lmp/test/nylon-class1.car
diff --git a/tools/msi2lmp/test/nylon.mdf b/tools/msi2lmp/test/nylon-class1.mdf
similarity index 100%
rename from tools/msi2lmp/test/nylon.mdf
rename to tools/msi2lmp/test/nylon-class1.mdf
diff --git a/tools/msi2lmp/test/runtests.sh b/tools/msi2lmp/test/runtests.sh
index 5f17bce9fc..8eedd5cb22 100755
--- a/tools/msi2lmp/test/runtests.sh
+++ b/tools/msi2lmp/test/runtests.sh
@@ -10,7 +10,7 @@ counter=0
 errors=0
 
 # Class1 tests
-for m in hydrogen water h2-h2o ethane benzene naphthalene
+for m in hydrogen water h2-h2o ethane benzene naphthalene crambin nylon
 do \
     before=$errors
     ${MSI2LMP} ${m}-class1 -c 1 -p ${verbose} 	\