diff --git a/lib/std/Target.zig b/lib/std/Target.zig
index 00b99fb38a3347589dbc34f073130dbd51b9dff9..5ca03f1381190fc8d70ea05470f0f1299f5b8c1a 100644
--- a/lib/std/Target.zig
+++ b/lib/std/Target.zig
@@ -3204,6 +3204,7 @@ pub fn cTypeByteSize(t: *const Target, c_type: CType) ?u16 {
         => @divExact(cTypeBitSize(t, c_type) orelse return null, 8),
 
         .longdouble => switch (cTypeBitSize(t, c_type) orelse return null) {
+            32 => 4,
             64 => 8,
             80 => @intCast(std.mem.alignForward(usize, 10, cTypeAlignment(t, c_type).?)),
             128 => 16,