diff --git a/lib/libspl/include/assert.h b/lib/libspl/include/assert.h
index b7b406850f7..820519c00ae 100644
--- a/lib/libspl/include/assert.h
+++ b/lib/libspl/include/assert.h
@@ -34,7 +34,7 @@
 #include <stdarg.h>
 
 #ifndef _KERNEL
-int aok;
+extern int aok;
 #endif
 
 static inline int
diff --git a/lib/libspl/zone.c b/lib/libspl/zone.c
index 5ca93b224d9..4a0e600ca3b 100644
--- a/lib/libspl/zone.c
+++ b/lib/libspl/zone.c
@@ -27,6 +27,8 @@
 #include <string.h>
 #include <errno.h>
 
+int aok = 0;
+
 zoneid_t
 getzoneid()
 {
diff --git a/tests/zfs-tests/tests/functional/checksum/edonr_test.c b/tests/zfs-tests/tests/functional/checksum/edonr_test.c
index a2a924e5d89..596ef2b3368 100644
--- a/tests/zfs-tests/tests/functional/checksum/edonr_test.c
+++ b/tests/zfs-tests/tests/functional/checksum/edonr_test.c
@@ -42,6 +42,8 @@
 typedef enum boolean { B_FALSE, B_TRUE } boolean_t;
 typedef	unsigned long long	u_longlong_t;
 
+int aok = 0;
+
 /*
  * Test messages from:
  * http://csrc.nist.gov/groups/ST/toolkit/documents/Examples/SHA_All.pdf