diff --git a/bin/wsim b/bin/wsim
index d930277ec..72ec81a22 100755
--- a/bin/wsim
+++ b/bin/wsim
@@ -90,9 +90,10 @@ else: EnableLog = 0
 prefix = ""
 if (args.lockstep or args.lockstepverbose or args.fcov or args.fcovimp):
     if (args.sim == "questa" or args.sim == "vcs"):
-        prefix = "IMPERAS_TOOLS=" + os.path.join(WALLY, "config", args.config, "imperas.ic")
-        if not os.path.isfile(prefix): # If config is a derivative, look for imperas.ic in derivative configs
-            prefix = "IMPERAS_TOOLS=" + os.path.join(WALLY, "config", "deriv", args.config, "imperas.ic")
+        imperasicPath = os.path.join(WALLY, "config", args.config, "imperas.ic")
+        if not os.path.isfile(imperasicPath): # If config is a derivative, look for imperas.ic in derivative configs
+            imperasicPath = os.path.join(WALLY, "config", "deriv", args.config, "imperas.ic")
+        prefix = "IMPERAS_TOOLS=" + imperasicPath
 # Force Questa to use 64-bit mode, sometimes it defaults to 32-bit even on 64-bit machines
 if (args.sim == "questa"):
     prefix = "MTI_VCO_MODE=64 " + prefix