diff --git a/cscripts/obsutils.py b/cscripts/obsutils.py
index 8dfbe64..a042b22 100755
--- a/cscripts/obsutils.py
+++ b/cscripts/obsutils.py
@@ -785,7 +785,7 @@ def get_onoff_obs(cls, obs):
         cls._log.header3('Creating On/Off observations')
 
     phagen = cscripts.csphagen(obs)
-    phagen['inexclusion'] = cls['inexclusion'].filename()
+    phagen['inexclusion'] = cls['inexclusion'].value()
     phagen['emin'] = cls['emin'].real()
     phagen['emax'] = cls['emax'].real()
     phagen['enumbins'] = cls['enumbins'].integer()
@@ -802,11 +802,11 @@ def get_onoff_obs(cls, obs):
     phagen['rad'] = cls['rad'].real()
     bkgmethod = cls['bkgmethod'].string()
     if bkgmethod == 'REFLECTED':
-        phagen['bkgregmin'] = cls['bkgregmin'].string()
-    phagen['maxoffset'] = cls['maxoffset'].string()
+        phagen['bkgregmin'] = cls['bkgregmin'].integer()
+    phagen['maxoffset'] = cls['maxoffset'].real()
     phagen['stack'] = True
-    phagen['emintrue'] = cls['emintrue'].real()
-    phagen['emaxtrue'] = cls['emaxtrue'].real()
+    phagen['etruemin'] = cls['etruemin'].real()
+    phagen['etruemax'] = cls['etruemax'].real()
     phagen['etruebins'] = cls['etruebins'].integer()
     phagen.run()
 
diff --git a/src/support/ctool.cpp b/src/support/ctool.cpp
index 81548e6..bea123a 100644
--- a/src/support/ctool.cpp
+++ b/src/support/ctool.cpp
@@ -1230,11 +1230,11 @@ bool ctool::is_onoff(void)
        }
        (*this)["maxoffset"].real();
        (*this)["etruemin"].real();
-       (*this)["etruemx"].real();
+       (*this)["etruemax"].real();
        (*this)["etruebins"].integer();
      }
 
-    // Return stacked flag
+    // Return onoff flag
     return onoff;
 }