diff --git a/src/python/gem5/components/memory/dramsim_3.py b/src/python/gem5/components/memory/dramsim_3.py
index e5c1877fb5..f154ba354f 100644
--- a/src/python/gem5/components/memory/dramsim_3.py
+++ b/src/python/gem5/components/memory/dramsim_3.py
@@ -32,6 +32,7 @@ def config_ds3(mem_type: str, num_chnls: int) -> Tuple[str, str]:
         os.pardir,
         os.pardir,
         "ext",
+        "dramsim3",
         "DRAMsim3",
     )
 
@@ -47,11 +48,11 @@ def config_ds3(mem_type: str, num_chnls: int) -> Tuple[str, str]:
             "Please navigate to `ext` and run:\n"
             "git clone git@github.com:umd-memsys/DRAMsim3.git"
         )
-    elif os.path.isdir(dramsim_3_mem_configs):
+    elif not os.path.isdir(dramsim_3_mem_configs):
         raise Exception(
             "The `ext/DRAMsim3/configs` directory cannot be found."
         )
-    elif os.path.isfile(input_file):
+    elif not os.path.isfile(input_file):
         raise Exception(
             "The configuration file '" + input_file + "' cannot  be found."
         )