diff --git a/library/yum b/library/yum
index 2d96136b8d1..5c380521259 100644
--- a/library/yum
+++ b/library/yum
@@ -168,15 +168,17 @@ def is_available(module, repoq, pkgspec, conf_file, qf=def_qf, en_repos=[], dis_
         return [ po_to_nevra(p) for p in pkgs ]
 
     else:
+        myrepoq = list(repoq)
+
         for repoid in en_repos:
             r_cmd = ['--enablerepo', repoid]
-            repoq.extend(r_cmd)
+            myrepoq.extend(r_cmd)
     
         for repoid in dis_repos:
             r_cmd = ['--disablerepo', repoid]
-            repoq.extend(r_cmd)
+            myrepoq.extend(r_cmd)
 
-        cmd = repoq + ["--qf", qf, pkgspec]
+        cmd = myrepoq + ["--qf", qf, pkgspec]
         rc,out,err = module.run_command(cmd)
         if rc == 0:
             return [ p for p in out.split('\n') if p.strip() ]
@@ -216,16 +218,17 @@ def is_update(module, repoq, pkgspec, conf_file, qf=def_qf, en_repos=[], dis_rep
         return set([ po_to_nevra(p) for p in retpkgs ])
 
     else:
+        myrepoq = list(repoq)
         for repoid in en_repos:
             r_cmd = ['--enablerepo', repoid]
-            repoq.extend(r_cmd)
+            myrepoq.extend(r_cmd)
     
         for repoid in dis_repos:
             r_cmd = ['--disablerepo', repoid]
-            repoq.extend(r_cmd)
+            myrepoq.extend(r_cmd)
 
 
-        cmd = repoq + ["--pkgnarrow=updates", "--qf", qf, pkgspec]
+        cmd = myrepoq + ["--pkgnarrow=updates", "--qf", qf, pkgspec]
         rc,out,err = module.run_command(cmd)
         
         if rc == 0:
@@ -261,18 +264,18 @@ def what_provides(module, repoq, req_spec, conf_file,  qf=def_qf, en_repos=[], d
         return set([ po_to_nevra(p) for p in pkgs ])
 
     else:
-
+        myrepoq = list(repoq)
         for repoid in en_repos:
             r_cmd = ['--enablerepo', repoid]
-            repoq.extend(r_cmd)
+            myrepoq.extend(r_cmd)
     
         for repoid in dis_repos:
             r_cmd = ['--disablerepo', repoid]
-            repoq.extend(r_cmd)
+            myrepoq.extend(r_cmd)
 
-        cmd = repoq + ["--qf", qf, "--whatprovides", req_spec]
+        cmd = myrepoq + ["--qf", qf, "--whatprovides", req_spec]
         rc,out,err = module.run_command(cmd)
-        cmd = repoq + ["--qf", qf, req_spec]
+        cmd = myrepoq + ["--qf", qf, req_spec]
         rc2,out2,err2 = module.run_command(cmd)
         if rc == 0 and rc2 == 0:
             out += out2