diff --git a/block-sys/build.rs b/block-sys/build.rs
index 454ac475c..57bcea0af 100644
--- a/block-sys/build.rs
+++ b/block-sys/build.rs
@@ -53,6 +53,7 @@ fn main() {
             }
         }
         (false, false, false, true) => {
+            // Add compability headers to make `#include <Block.h>` work.
             let compat_headers = Path::new(env!("CARGO_MANIFEST_DIR")).join("compat-headers/objfw");
             cc_args.push_str(" -I");
             cc_args.push_str(compat_headers.to_str().unwrap());
diff --git a/objc-sys/build.rs b/objc-sys/build.rs
index 1f80b3ec2..cc05758f1 100644
--- a/objc-sys/build.rs
+++ b/objc-sys/build.rs
@@ -1,4 +1,4 @@
-use std::env;
+use std::{env, path::Path};
 
 /// TODO: Better validation of this
 ///
@@ -219,11 +219,21 @@ fn main() {
     // - `-miphoneos-version-min={}`
     // - `-mmacosx-version-min={}`
     // - ...
-    println!(
-        "cargo:cc_args=-fobjc-arc -fobjc-arc-exceptions -fobjc-exceptions -fobjc-runtime={}",
-        // TODO: -fobjc-weak ?
+    //
+    // TODO: -fobjc-weak ?
+    let mut cc_args = format!(
+        "-fobjc-arc -fobjc-arc-exceptions -fobjc-exceptions -fobjc-runtime={}",
         clang_runtime
-    ); // DEP_OBJC_CC_ARGS
+    );
+
+    if let Runtime::ObjFW(_) = &runtime {
+        // Add compability headers to make `#include <objc/objc.h>` work.
+        let compat_headers = Path::new(env!("CARGO_MANIFEST_DIR")).join("compat-headers-objfw");
+        cc_args.push_str(" -I");
+        cc_args.push_str(compat_headers.to_str().unwrap());
+    }
+
+    println!("cargo:cc_args={}", cc_args); // DEP_OBJC_CC_ARGS
 
     if let Runtime::ObjFW(_) = &runtime {
         // Link to libobjfw-rt
diff --git a/objc-sys/compat-headers-objfw/objc/objc.h b/objc-sys/compat-headers-objfw/objc/objc.h
new file mode 100644
index 000000000..9cc6bbd8f
--- /dev/null
+++ b/objc-sys/compat-headers-objfw/objc/objc.h
@@ -0,0 +1 @@
+#import <ObjFW/ObjFW-RT.h>
diff --git a/objc-sys/compat-headers-objfw/objc/runtime.h b/objc-sys/compat-headers-objfw/objc/runtime.h
new file mode 100644
index 000000000..9cc6bbd8f
--- /dev/null
+++ b/objc-sys/compat-headers-objfw/objc/runtime.h
@@ -0,0 +1 @@
+#import <ObjFW/ObjFW-RT.h>