diff --git a/p3analysis/plot/backend/matplotlib.py b/p3analysis/plot/backend/matplotlib.py
index 387ef33..c09d005 100644
--- a/p3analysis/plot/backend/matplotlib.py
+++ b/p3analysis/plot/backend/matplotlib.py
@@ -467,7 +467,7 @@ def __init__(
         else:
             if eff not in ["app", "arch"]:
                 raise ValueError("'eff' must be 'app' or 'arch'.")
-            pp_column = eff + " eff"
+            pp_column = eff + " pp"
             if pp_column not in pp:
                 msg = "DataFrame does not contain an '%s' column."
                 raise ValueError(msg % (pp_column))
diff --git a/p3analysis/plot/backend/pgfplots.py b/p3analysis/plot/backend/pgfplots.py
index ef509a4..030563a 100644
--- a/p3analysis/plot/backend/pgfplots.py
+++ b/p3analysis/plot/backend/pgfplots.py
@@ -289,7 +289,7 @@ def __init__(
         else:
             if eff not in ["app", "arch"]:
                 raise ValueError("'eff' must be 'app' or 'arch'.")
-            pp_column = eff + " eff"
+            pp_column = eff + " pp"
             if pp_column not in pp:
                 msg = "DataFrame does not contain an '%s' column."
                 raise ValueError(msg % (pp_column))
diff --git a/tests/plot/test_navchart.py b/tests/plot/test_navchart.py
index 24753b2..95f0d92 100644
--- a/tests/plot/test_navchart.py
+++ b/tests/plot/test_navchart.py
@@ -34,6 +34,19 @@ def test_required_columns(self):
         with self.assertRaises(ValueError):
             navchart(pp, cd, eff="invalid")
 
+        pp = pd.DataFrame({
+            "problem": ["problem"],
+            "platform": ["platform"],
+            "application": ["application"],
+            "app pp": [1.0],
+        })
+        cd = pd.DataFrame({
+            "problem": ["problem"],
+            "application": ["application"],
+            "divergence": [0.0],
+        })
+        navchart(pp, cd)
+
     def test_options(self):
         """p3analysis.plot.navchart.options"""