diff --git a/include/toolchain.h b/include/toolchain.h
index d2c08a6719d..3b7d5bfefcf 100644
--- a/include/toolchain.h
+++ b/include/toolchain.h
@@ -37,6 +37,11 @@
 #include <toolchain/xcc.h>
 #elif defined(__GNUC__) || (defined(_LINKER) && defined(__GCC_LINKER_CMD__))
 #include <toolchain/gcc.h>
+#else
+/* This include line exists for off-tree definitions of compilers,
+ * and therefore this header is not meant to exist in-tree
+ */
+#include <toolchain/other.h>
 #endif
 
 /*