diff --git a/src/libpanic_abort/lib.rs b/src/libpanic_abort/lib.rs
index 29a9e1aadaf3c..c3bd6a2bc187d 100644
--- a/src/libpanic_abort/lib.rs
+++ b/src/libpanic_abort/lib.rs
@@ -53,7 +53,7 @@ pub unsafe extern fn __rust_maybe_catch_panic(f: fn(*mut u8),
 pub unsafe extern fn __rust_start_panic(_data: usize, _vtable: usize) -> u32 {
     abort();
 
-    #[cfg(unix)]
+    #[cfg(any(unix, target_os = "cloudabi"))]
     unsafe fn abort() -> ! {
         extern crate libc;
         libc::abort();
diff --git a/src/libpanic_unwind/lib.rs b/src/libpanic_unwind/lib.rs
index 6b8da7a51ceb8..92e40e8f26d40 100644
--- a/src/libpanic_unwind/lib.rs
+++ b/src/libpanic_unwind/lib.rs
@@ -68,6 +68,7 @@ mod imp;
 
 // i686-pc-windows-gnu and all others
 #[cfg(any(all(unix, not(target_os = "emscripten")),
+          target_os = "cloudabi",
           target_os = "redox",
           all(windows, target_arch = "x86", target_env = "gnu")))]
 #[path = "gcc.rs"]