diff --git a/src/lib.zig b/src/lib.zig
index 3a98abdbec43d48c087b258d5123a17cd16f5cd4..e9b876240919d39b0ce5dd3ae5a2e7853d8161a4 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -1,5 +1,6 @@
 const std = @import("std");
 const string = []const u8;
+const range = @import("range").range;
 
 pub fn fmtByteCountIEC(alloc: *std.mem.Allocator, b: u64) !string {
     return try reduceNumber(alloc, b, 1024, "B", "KMGTPEZY");
@@ -54,3 +55,11 @@ pub fn base64EncodeAlloc(alloc: *std.mem.Allocator, input: string) !string {
     var buf = try alloc.alloc(u8, base64.calcSize(input.len));
     return base64.encode(buf, input);
 }
+
+pub fn asciiUpper(alloc: *std.mem.Allocator, input: string) !string {
+    var buf = try alloc.dupe(u8, input);
+    for (range(buf.len)) |_, i| {
+        buf[i] = std.ascii.toUpper(buf[i]);
+    }
+    return buf;
+}
diff --git a/zig.mod b/zig.mod
index 596d8af23f1811b4bb24160ae8ac993efeba5fce..fa95ec6412cf26edc8776c8b1d30c79928e4f1cb 100644
--- a/zig.mod
+++ b/zig.mod
@@ -4,3 +4,4 @@ main: src/lib.zig
 license: MIT
 description: An assortment of random utility functions that aren't in std and don't deserve their own pacakge.
 dependencies:
+  - src: git https://github.com/nektro/zig-range