diff --git a/src/tools/bin/plotNumericalHeating b/src/tools/bin/plotNumericalHeating
index 5064aef21c..6aec05a690 100755
--- a/src/tools/bin/plotNumericalHeating
+++ b/src/tools/bin/plotNumericalHeating
@@ -119,7 +119,7 @@ for sim in directories:
     mydir = sim+simDir
     # get relevant files with energy
     files = [f for f in os.listdir(mydir)
-             if os.path.isfile(os.path.join(mydir, f)) and (re.search('^.*_energy_all.dat', f) or re.search('^.fields_energy.dat', f))]
+             if os.path.isfile(os.path.join(mydir, f)) and (re.search('^.*_energy_all.dat', f) or re.search('^fields_energy.dat', f))]
     # check if file list is empty
     if len(files) == 0:
         sys.exit("There were no energy files in \"{}\".".format(mydir))