diff --git a/tests/src/mmap_stress.c b/tests/src/mmap_stress.c
index c541bd6b..4ec2220b 100644
--- a/tests/src/mmap_stress.c
+++ b/tests/src/mmap_stress.c
@@ -108,6 +108,8 @@ static void *run_test_func(void *ptr)
 			memcpy(addr, buf, size); /* noerr */
 			break;
 		}
+
+		usleep(10000);
 	}
 
 	munmap(addr, size);
diff --git a/tests/tests/mmap.sh b/tests/tests/mmap.sh
index 4b14d516..8b617a36 100644
--- a/tests/tests/mmap.sh
+++ b/tests/tests/mmap.sh
@@ -5,7 +5,7 @@
 t_require_commands mmap_stress mmap_validate scoutfs xfs_io
 
 echo "== mmap_stress"
-mmap_stress 8192 30 "$T_D0/mmap_stress" "$T_D1/mmap_stress" "$T_D2/mmap_stress" "$T_D3/mmap_stress" "$T_D4/mmap_stress" | sed 's/:.*//g' | sort
+mmap_stress 8192 30 "$T_D0/mmap_stress" "$T_D0/mmap_stress" "$T_D0/mmap_stress" "$T_D3/mmap_stress" "$T_D3/mmap_stress" | sed 's/:.*//g' | sort
 
 echo "== basic mmap/read/write consistency checks"
 mmap_validate 256 1000 "$T_D0/mmap_val1" "$T_D1/mmap_val1"