diff --git a/src/aegis128x4/aegis128x4_avx512.c b/src/aegis128x4/aegis128x4_avx512.c
index 1501b6d..610aa0f 100644
--- a/src/aegis128x4/aegis128x4_avx512.c
+++ b/src/aegis128x4/aegis128x4_avx512.c
@@ -13,8 +13,13 @@
 #    ifdef HAVE_VAESINTRIN_H
 
 #        ifdef __clang__
-#            pragma clang attribute push(__attribute__((target("vaes,avx512f"))), \
-                                         apply_to = function)
+#            if __clang_major__ >= 18
+#                pragma clang attribute push(__attribute__((target("vaes,avx512f,evex512"))), \
+                                             apply_to = function)
+#            else
+#                pragma clang attribute push(__attribute__((target("vaes,avx512f"))), \
+                                             apply_to = function)
+#            endif
 #        elif defined(__GNUC__)
 #            pragma GCC target("vaes,avx512f")
 #        endif
diff --git a/src/aegis256x4/aegis256x4_avx512.c b/src/aegis256x4/aegis256x4_avx512.c
index 652fee9..20ff319 100644
--- a/src/aegis256x4/aegis256x4_avx512.c
+++ b/src/aegis256x4/aegis256x4_avx512.c
@@ -13,8 +13,13 @@
 #    ifdef HAVE_VAESINTRIN_H
 
 #        ifdef __clang__
-#            pragma clang attribute push(__attribute__((target("vaes,avx512f"))), \
+#            if __clang_major__ >= 18
+#                pragma clang attribute push(__attribute__((target("vaes,avx512f,evex512"))), \
                                              apply_to = function)
+#            else
+#                pragma clang attribute push(__attribute__((target("vaes,avx512f"))), \
+                                             apply_to = function)
+#            endif
 #        elif defined(__GNUC__)
 #            pragma GCC target("vaes,avx512f")
 #        endif