diff --git a/src/codegen/c.zig b/src/codegen/c.zig
index 33339f589d7bd8cbc5cd1e4b981a4a27d6aafa2b..2ae0421008b770a3e7da293628e93252b67fd09d 100644
--- a/src/codegen/c.zig
+++ b/src/codegen/c.zig
@@ -3180,6 +3180,7 @@ fn airSwitchBr(f: *Function, inst: Air.Inst.Index) !CValue {
     const writer = f.object.writer();
 
     try writer.writeAll("switch (");
+    if (condition_ty.tag() == .bool) try writer.writeAll("(int)");
     try f.writeCValue(writer, condition);
     try writer.writeAll(") {");
     f.object.indent_writer.pushIndent();