diff --git a/libc/bionic/libc_init_common.h b/libc/bionic/libc_init_common.h
index 14105f8..59dc7df 100644
--- a/libc/bionic/libc_init_common.h
+++ b/libc/bionic/libc_init_common.h
@@ -49,7 +49,7 @@
 __END_DECLS
 
 #if defined(__cplusplus)
-struct KernelArgumentBlock;
+class KernelArgumentBlock;
 void __LIBC_HIDDEN__ __libc_init_common(KernelArgumentBlock& args);
 #endif