diff --git a/pyproject.toml b/pyproject.toml
index 88906c2..9523311 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -48,7 +48,8 @@ dev = ["anybadge",
        "pytest",
        "pytest-coverage",
        "pytest-mypy",
-       "hatchling"]
+       "hatchling",
+       "memray"]
 
 [project.scripts]
 run_ssim = "varprodmdstatspy.varprodmd_ssim_performance:run_ssim"
diff --git a/varprodmdstatspy/varprodmd_ssim_performance.py b/varprodmdstatspy/varprodmd_ssim_performance.py
index 1d6d23d..fc3dafc 100644
--- a/varprodmdstatspy/varprodmd_ssim_performance.py
+++ b/varprodmdstatspy/varprodmd_ssim_performance.py
@@ -246,7 +246,7 @@ def run_ssim():
     STD = [0, 1e-4, 1e-3, 1e-2]
     N_RUNS = 100
     COMPS = [0, 0.4, 0.6, 0.8]
-    FCTS = list(fcts.keys)
+    FCTS = list(fcts.keys())
 
     currentdir = os.path.dirname(os.path.abspath(
         inspect.getfile(inspect.currentframe())))