diff --git a/module/zfs/qat_compress.c b/module/zfs/qat_compress.c
index a350c0f3e93b..99d1c9a12d6f 100644
--- a/module/zfs/qat_compress.c
+++ b/module/zfs/qat_compress.c
@@ -104,8 +104,8 @@ static kstat_t *qat_ksp;
 static CpaInstanceHandle dc_inst_handles[MAX_INSTANCES];
 static CpaDcSessionHandle session_handles[MAX_INSTANCES];
 static CpaBufferList **buffer_array[MAX_INSTANCES];
-static Cpa16U num_inst = 0;
-static Cpa16U inst_num = 0;
+static Cpa32U num_inst = 0;
+static Cpa32U inst_num = 0;
 static boolean_t qat_init_done = B_FALSE;
 int zfs_qat_disable = 0;