diff --git a/std/math.zig b/std/math.zig
index 765df6280cd59f7d5c15381b9e0e9bde1f04c470..7464a9fc974826a765b053ae1b241ba4d455fc9b 100644
--- a/std/math.zig
+++ b/std/math.zig
@@ -680,6 +680,11 @@ pub fn alignCast(comptime alignment: u29, ptr: var) AlignCastError!@typeOf(@alig
     return @alignCast(alignment, ptr);
 }
 
+pub fn isPowerOfTwo(v: var) bool {
+    assert(v != 0);
+    return (v & (v - 1)) == 0;
+}
+
 pub fn floorPowerOfTwo(comptime T: type, value: T) T {
     var x = value;