diff --git a/cc/ccdeps.go b/cc/ccdeps.go
index 9b89110..4e23a7b 100644
--- a/cc/ccdeps.go
+++ b/cc/ccdeps.go
@@ -142,7 +142,7 @@
 			compilerParams.HeaderSearchPath =
 				append(compilerParams.HeaderSearchPath, strings.TrimPrefix(param, "-I"))
 		case systemHeaderSearchPath:
-			if i < len(params)-1 {
+			if i < len(cparams)-1 {
 				compilerParams.SystemHeaderSearchPath = append(compilerParams.SystemHeaderSearchPath, cparams[i+1])
 			}
 			i = i + 1