diff --git a/src/lisp.h b/src/lisp.h
index e8eab7be9eb..af73c4b15ce 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -262,10 +262,6 @@ DEFINE_GDB_SYMBOL_END (USE_LSB_TAG)
 error !;
 #endif
 
-#ifndef alignas
-# error "alignas not defined"
-#endif
-
 #ifdef HAVE_STRUCT_ATTRIBUTE_ALIGNED
 # define GCALIGNED __attribute__ ((aligned (GCALIGNMENT)))
 #else