diff --git a/src/codegen/c.zig b/src/codegen/c.zig
index 425663ad9cf0554f76f6ac84a2dd3177aaa6a883..589e2f17e0f379a354b2ed044f3077ec15d0dc88 100644
--- a/src/codegen/c.zig
+++ b/src/codegen/c.zig
@@ -26,15 +26,19 @@ fn renderType(ctx: *Context, header: *C.Header, writer: std.ArrayList(u8).Writer
             try writer.writeAll("zig_noreturn void");
         },
         .Void => try writer.writeAll("void"),
+        .Bool => try writer.writeAll("bool"),
         .Int => {
             if (T.tag() == .u8) {
                 header.need_stdint = true;
                 try writer.writeAll("uint8_t");
+            } else if (T.tag() == .u32) {
+                header.need_stdint = true;
+                try writer.writeAll("uint32_t");
             } else if (T.tag() == .usize) {
                 header.need_stddef = true;
                 try writer.writeAll("size_t");
             } else {
-                return ctx.fail(ctx.decl.src(), "TODO implement int types", .{});
+                return ctx.fail(ctx.decl.src(), "TODO implement int type {}", .{T});
             }
         },
         else => |e| return ctx.fail(ctx.decl.src(), "TODO implement type {}", .{e}),
diff --git a/src/link/cbe.h b/src/link/cbe.h
index 854032227d1aed97b78f359c282efecb0f5f5e8b..f35c6b8ffffb1f71678e961a2d7eeeb2b12894b1 100644
--- a/src/link/cbe.h
+++ b/src/link/cbe.h
@@ -1,3 +1,12 @@
+#if __STDC_VERSION__ >= 199901L
+// C99 or newer
+#include <stdbool.h>
+#else
+#define bool unsigned char
+#define true 1
+#define false 0
+#endif
+
 #if __STDC_VERSION__ >= 201112L
 #define zig_noreturn _Noreturn
 #elif __GNUC__