diff --git a/std/json.zig b/std/json.zig
index e135911170..8324c59e32 100644
--- a/std/json.zig
+++ b/std/json.zig
@@ -1023,7 +1023,7 @@ pub const Value = union(enum) {
                 debug.warn("{}", inner);
             },
             Value.Float => |inner| {
-                debug.warn("{.5}", inner);
+                debug.warn("{:.5}", inner);
             },
             Value.String => |inner| {
                 debug.warn("\"{}\"", inner);
@@ -1078,7 +1078,7 @@ pub const Value = union(enum) {
                 debug.warn("{}", inner);
             },
             Value.Float => |inner| {
-                debug.warn("{.5}", inner);
+                debug.warn("{:.5}", inner);
             },
             Value.String => |inner| {
                 debug.warn("\"{}\"", inner);
diff --git a/std/zig/bench.zig b/std/zig/bench.zig
index b43c491c97..e0723d8519 100644
--- a/std/zig/bench.zig
+++ b/std/zig/bench.zig
@@ -25,7 +25,7 @@ pub fn main() !void {
 
     var stdout_file = try std.io.getStdOut();
     const stdout = &stdout_file.outStream().stream;
-    try stdout.print("{.3} MiB/s, {} KiB used \n", mb_per_sec, memory_used / 1024);
+    try stdout.print("{:.3} MiB/s, {} KiB used \n", mb_per_sec, memory_used / 1024);
 }
 
 fn testOnce() usize {