diff --git a/bsd-user/host/i386/host-signal.h b/bsd-user/host/i386/host-signal.h
index 169e61b154..ffdfaba534 100644
--- a/bsd-user/host/i386/host-signal.h
+++ b/bsd-user/host/i386/host-signal.h
@@ -9,6 +9,7 @@
 #ifndef I386_HOST_SIGNAL_H
 #define I386_HOST_SIGNAL_H
 
+#include <sys/param.h>
 #include <sys/ucontext.h>
 #include <machine/trap.h>
 #include <vm/pmap.h>
diff --git a/bsd-user/host/x86_64/host-signal.h b/bsd-user/host/x86_64/host-signal.h
index 47ca19f881..32ac4e4180 100644
--- a/bsd-user/host/x86_64/host-signal.h
+++ b/bsd-user/host/x86_64/host-signal.h
@@ -9,6 +9,7 @@
 #ifndef X86_64_HOST_SIGNAL_H
 #define X86_64_HOST_SIGNAL_H
 
+#include <sys/param.h>
 #include <sys/ucontext.h>
 #include <machine/trap.h>
 #include <vm/pmap.h>