diff --git a/lib/alloca86-bt.S b/lib/alloca86-bt.S
index 76a85a0..ffad515 100644
--- a/lib/alloca86-bt.S
+++ b/lib/alloca86-bt.S
@@ -40,4 +40,8 @@ p6:
     push    %edx
     ret
 
+/* mark stack as nonexecutable */
+#if defined __ELF__ && defined __linux__
+    .section    .note.GNU-stack,"",@progbits
+#endif
 /* ---------------------------------------------- */
diff --git a/lib/alloca86.S b/lib/alloca86.S
index b06d4c4..b836efb 100644
--- a/lib/alloca86.S
+++ b/lib/alloca86.S
@@ -28,4 +28,8 @@ p3:
     push    %edx
     ret
 
+/* mark stack as nonexecutable */
+#if defined __ELF__ && defined __linux__
+    .section    .note.GNU-stack,"",@progbits
+#endif
 /* ---------------------------------------------- */
diff --git a/lib/alloca86_64.S b/lib/alloca86_64.S
index 44f66c8..dd46ce6 100644
--- a/lib/alloca86_64.S
+++ b/lib/alloca86_64.S
@@ -35,4 +35,8 @@ p3:
     push    %rdx
     ret
 
+/* mark stack as nonexecutable */
+#if defined __ELF__ && defined __linux__
+    .section    .note.GNU-stack,"",@progbits
+#endif
 /* ---------------------------------------------- */