diff --git a/pymbolic/interop/maxima.py b/pymbolic/interop/maxima.py
index eba2781499032b01c3617b6a65ccaf0eb325048a..9a1fc448ef1824873d1cef8ef2971cefa5fa016e 100644
--- a/pymbolic/interop/maxima.py
+++ b/pymbolic/interop/maxima.py
@@ -47,7 +47,6 @@ from pymbolic.parser import Parser as ParserBase, FinalizedTuple
 
 # {{{ check for maxima executable
 
-
 def _find_maxima_executable():
     import os
 
@@ -56,7 +55,7 @@ def _find_maxima_executable():
 
     global FOUND_MAXIMA
 
-    executable = os.environ.get("SUMPY_MAXIMA_EXECUTABLE", "maxima")
+    executable = os.environ.get("PYMBOLIC_MAXIMA_EXECUTABLE", "maxima")
 
     FOUND_MAXIMA = False
     if is_executable(executable):