diff --git a/lib/ramble/ramble/expander.py b/lib/ramble/ramble/expander.py
index 344b51b9c..abaa71be7 100644
--- a/lib/ramble/ramble/expander.py
+++ b/lib/ramble/ramble/expander.py
@@ -528,13 +528,6 @@ def perform_math_eval(self, in_str):
         """
         try:
             math_ast = ast.parse(in_str, mode='eval')
-            # If the only node in the AST is a constant, return an unmodified
-            # in_str.
-            is_num_const = isinstance(math_ast.body, ast.Constant) and \
-                hasattr(math_ast.body, 'value')
-            backport_num_const = isinstance(math_ast.body, ast.Num) and hasattr(math_ast.body, 'n')
-            if is_num_const or backport_num_const:
-                return in_str
             out_str = self.eval_math(math_ast.body)
             return out_str
         except MathEvaluationError as e:
diff --git a/lib/ramble/ramble/test/expander.py b/lib/ramble/ramble/test/expander.py
index 0b0992487..ae622f749 100644
--- a/lib/ramble/ramble/test/expander.py
+++ b/lib/ramble/ramble/test/expander.py
@@ -29,6 +29,7 @@ def exp_dict():
         'var2': '{var3}',
         'var3': '3',
         'decimal.06.var': 'foo',
+        'size': '0000.96'
     }
 
 
@@ -51,6 +52,7 @@ def exp_dict():
         ('{{n_ranks}+2}', '6'),
         ('{{n_ranks}*{var{processes_per_node}}:05d}', '00012'),
         ('{{n_ranks}-1}', '3'),
+        ('{{{n_ranks}/2}:0.0f}', '2')
     ]
 )
 def test_expansions(input, output):
diff --git a/var/ramble/repos/builtin/applications/gromacs/application.py b/var/ramble/repos/builtin/applications/gromacs/application.py
index 3171558fa..5eff27516 100644
--- a/var/ramble/repos/builtin/applications/gromacs/application.py
+++ b/var/ramble/repos/builtin/applications/gromacs/application.py
@@ -110,10 +110,10 @@ class Gromacs(SpackApplication):
                       description='Workload type.',
                       values=['pme', 'rf'],
                       workloads=['water_gmx50', 'water_bare'])
-    workload_variable('input_path', default='{water_gmx50_bare}/{size}',
+    workload_variable('input_path', default='{water_gmx50_bare}/*{size}',
                       description='Input path for water GMX50',
                       workload='water_gmx50')
-    workload_variable('input_path', default='{water_bare_hbonds}/{size}',
+    workload_variable('input_path', default='{water_bare_hbonds}/*{size}',
                       description='Input path for water bare hbonds',
                       workload='water_bare')
     workload_variable('input_path', default='{lignocellulose}/lignocellulose-rf.tpr',