diff --git a/tests/sys/cddl/zfs/bin/readmmap.c b/tests/sys/cddl/zfs/bin/readmmap.c
--- a/tests/sys/cddl/zfs/bin/readmmap.c
+++ b/tests/sys/cddl/zfs/bin/readmmap.c
@@ -83,7 +83,7 @@
 
 	bytes = write(fd, buf, size);
 	if (bytes != size) {
-		(void) printf("short write: %d != %ud\n", bytes, size);
+		(void) printf("short write: %d != %zu\n", bytes, size);
 		retval = 1;
 		goto end;
 	}
@@ -114,20 +114,20 @@
 
 	bytes = pread(fd, buf, size, 0);
 	if (bytes != size) {
-		(void) printf("short read: %d != %ud\n", bytes, size);
+		(void) printf("short read: %d != %zu\n", bytes, size);
 		retval = 1;
 		goto end;
 	}
 
 	if (buf[idx] != 1) {
 		(void) printf(
-		    "bad data from read!  got buf[%ud]=%d, expected 1\n",
+		    "bad data from read!  got buf[%zu]=%d, expected 1\n",
 		    idx, buf[idx]);
 		retval = 1;
 		goto end;
 	}
 
-	(void) printf("good data from read: buf[%ud]=1\n", idx);
+	(void) printf("good data from read: buf[%zu]=1\n", idx);
 end:
 	if (fd != -1) {
 		(void) close(fd);
diff --git a/tests/sys/cddl/zfs/tests/ctime/ctime_001_pos.c b/tests/sys/cddl/zfs/tests/ctime/ctime_001_pos.c
--- a/tests/sys/cddl/zfs/tests/ctime/ctime_001_pos.c
+++ b/tests/sys/cddl/zfs/tests/ctime/ctime_001_pos.c
@@ -227,7 +227,7 @@
 	(void) close(fd);
 
 	if (ret != 0) {
-		fprintf(stderr, "read(%d, buf, %d)\n", fd, sizeof (buf));
+		fprintf(stderr, "read(%d, buf, %zu)\n", fd, sizeof (buf));
 		exit(1);
 	}
 
@@ -253,7 +253,7 @@
 	(void) close(fd);
 
 	if (ret != 0) {
-		fprintf(stderr, "write(%d, buf, %d)\n", fd, strlen(buf));
+		fprintf(stderr, "write(%d, buf, %zu)\n", fd, strlen(buf));
 		exit(1);
 	}
 
diff --git a/tests/sys/cddl/zfs/tests/txg_integrity/fsync_integrity.c b/tests/sys/cddl/zfs/tests/txg_integrity/fsync_integrity.c
--- a/tests/sys/cddl/zfs/tests/txg_integrity/fsync_integrity.c
+++ b/tests/sys/cddl/zfs/tests/txg_integrity/fsync_integrity.c
@@ -332,7 +332,7 @@
       int file_offset = chunk_start + chunk_offset;
       if (good_data && (actual_buf[i] != desired_buf[i])){
         fprintf(stderr, "fsync_integrity: miscompare at "
-	    "chunk %i, chunk offset %lx, file offset %lx\n",
+	    "chunk %i, chunk offset %x, file offset %x\n",
 	    chunk_idx, chunk_offset, file_offset);
         fprintf(stderr, "Expected %016lx, got %016lx\n",
 	    desired_buf[i], actual_buf[i]);
@@ -341,7 +341,7 @@
       }
       else if (!good_data && (actual_buf[i] == desired_buf[i])) {
       	fprintf(stderr, "fsync_integrity: miscompare ends at "
-	    "chunk %i, chunk offset %lx, file offset %lx\n",
+	    "chunk %i, chunk offset %x, file offset %x\n",
 	    chunk_idx, chunk_offset, file_offset);
 	good_data = 1;
       }
diff --git a/tests/sys/cddl/zfs/tests/txg_integrity/txg_integrity.c b/tests/sys/cddl/zfs/tests/txg_integrity/txg_integrity.c
--- a/tests/sys/cddl/zfs/tests/txg_integrity/txg_integrity.c
+++ b/tests/sys/cddl/zfs/tests/txg_integrity/txg_integrity.c
@@ -370,7 +370,7 @@
       int file_offset = chunk_start + chunk_offset;
       if (good_data && (actual_buf[i] != desired_buf[i])){
         fprintf(stderr, "txg_integrity: miscompare at "
-	    "chunk %i, chunk offset %lx, file offset %lx\n",
+	    "chunk %i, chunk offset %x, file offset %x\n",
 	    chunk_idx, chunk_offset, file_offset);
         fprintf(stderr, "Expected %16lx, got %16lx\n",
 	    desired_buf[i], actual_buf[i]);
@@ -379,7 +379,7 @@
       }
       else if (!good_data && (actual_buf[i] == desired_buf[i])) {
       	fprintf(stderr, "txg_integrity: miscompare ends at "
-	    "chunk %i, chunk offset %lx, file offset %lx\n",
+	    "chunk %i, chunk offset %x, file offset %x\n",
 	    chunk_idx, chunk_offset, file_offset);
 	good_data = 1;
       }