diff --git a/sys/amd64/include/pcb.h b/sys/amd64/include/pcb.h
index 50cff077471..fd06e7c6bbb 100644
--- a/sys/amd64/include/pcb.h
+++ b/sys/amd64/include/pcb.h
@@ -79,6 +79,9 @@ struct pcb {
  * core dumps. For the i386: ???
  */
 struct md_coredump {
+#ifdef lint
+	int dummy;
+#endif
 };
 
 #ifdef _KERNEL
diff --git a/sys/amd64/include/proc.h b/sys/amd64/include/proc.h
index f011b5c3714..e3711b0305c 100644
--- a/sys/amd64/include/proc.h
+++ b/sys/amd64/include/proc.h
@@ -51,6 +51,9 @@ struct proc_ldt {
  * Machine-dependent part of the proc structure for i386.
  */
 struct mdthread {
+#ifdef lint
+	int	dummy;
+#endif
 };
 
 struct mdproc {
diff --git a/sys/i386/include/pcb.h b/sys/i386/include/pcb.h
index 50cff077471..fd06e7c6bbb 100644
--- a/sys/i386/include/pcb.h
+++ b/sys/i386/include/pcb.h
@@ -79,6 +79,9 @@ struct pcb {
  * core dumps. For the i386: ???
  */
 struct md_coredump {
+#ifdef lint
+	int dummy;
+#endif
 };
 
 #ifdef _KERNEL
diff --git a/sys/i386/include/proc.h b/sys/i386/include/proc.h
index f011b5c3714..e3711b0305c 100644
--- a/sys/i386/include/proc.h
+++ b/sys/i386/include/proc.h
@@ -51,6 +51,9 @@ struct proc_ldt {
  * Machine-dependent part of the proc structure for i386.
  */
 struct mdthread {
+#ifdef lint
+	int	dummy;
+#endif
 };
 
 struct mdproc {