diff --git a/lib/libspl/page.c b/lib/libspl/page.c
index ad9aad9982..5b0d3f2e57 100644
--- a/lib/libspl/page.c
+++ b/lib/libspl/page.c
@@ -21,6 +21,7 @@
  */
 
 #include <unistd.h>
+#include <sys/param.h>
 
 static size_t pagesize = 0;