diff --git a/autosolvate/resp_classes/resptools/resp_gamess.py b/autosolvate/resp_classes/resptools/resp_gamess.py
index bcc5aff..ae09eed 100644
--- a/autosolvate/resp_classes/resptools/resp_gamess.py
+++ b/autosolvate/resp_classes/resptools/resp_gamess.py
@@ -134,6 +134,7 @@ def writeGAMESSInput(self, calculation = 'singlepoint'):
         
         # Header for energy minimization.
         gamess_header['optimize'] = """\
+ $SYSTEM MWORDS=128 $END   
  $CONTRL SCFTYP={scf} EXETYP=RUN RUNTYP=OPTIMIZE COORD=UNIQUE $END
  $CONTRL ICHARG={charge} MULT={multiplicity} $END
  $CONTRL MOLPLT=.TRUE. UNITS=ANGS NPRINT=8 $END
@@ -148,6 +149,7 @@ def writeGAMESSInput(self, calculation = 'singlepoint'):
      
         # Header for no optimization case.
         gamess_header['singlepoint'] = """\
+ $SYSTEM MWORDS=128 $END   
  $CONTRL SCFTYP={scf} EXETYP=RUN RUNTYP=ENERGY COORD=UNIQUE $END
  $CONTRL ICHARG={charge} MULT={multiplicity} $END
  $CONTRL MOLPLT=.TRUE. UNITS=ANGS NPRINT=8 $END