diff --git a/src/lib.zig b/src/lib.zig
index adf17ed5a618d996cd1036626c8ee142ede0de9a..8d87730a75308b2e549c8efe2d9b23c34aa68121 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -100,7 +100,7 @@ pub fn parseEnv() !void {
 
 fn fixNameForEnv(alloc: std.mem.Allocator, input: string) !string {
     var ret = try extras.asciiUpper(alloc, input);
-    for (range(ret.len)) |_, i| {
+    for (0..ret.len) |i| {
         if (ret[i] == '-') {
             ret[i] = '_';
         }