Index: src/os_unix.c
==================================================================
--- src/os_unix.c
+++ src/os_unix.c
@@ -4043,11 +4043,11 @@
 
   /* Shared locks never span more than one byte */
   assert( n==1 || lockType!=F_RDLCK );
 
   /* Locks are within range */
-  assert( n>=1 && n<SQLITE_SHM_NLOCK );
+  assert( n>=1 && n<=SQLITE_SHM_NLOCK );
 
   if( pShmNode->h>=0 ){
     /* Initialize the locking parameters */
     memset(&f, 0, sizeof(f));
     f.l_type = lockType;