diff --git a/scripts/code.py b/scripts/code.py
index bd49c5ea..e18961de 100755
--- a/scripts/code.py
+++ b/scripts/code.py
@@ -90,7 +90,7 @@ class RInt(co.namedtuple('RInt', 'x')):
         elif not old and not new:
             return 0.0
         elif not old:
-            return 1.0
+            return +m.inf
         else:
             return (new-old) / old
 
diff --git a/scripts/cov.py b/scripts/cov.py
index 232e2d40..7cfbf3e6 100755
--- a/scripts/cov.py
+++ b/scripts/cov.py
@@ -90,7 +90,7 @@ class RInt(co.namedtuple('RInt', 'x')):
         elif not old and not new:
             return 0.0
         elif not old:
-            return 1.0
+            return +m.inf
         else:
             return (new-old) / old
 
diff --git a/scripts/data.py b/scripts/data.py
index 245cb88c..cd79a12c 100755
--- a/scripts/data.py
+++ b/scripts/data.py
@@ -90,7 +90,7 @@ class RInt(co.namedtuple('RInt', 'x')):
         elif not old and not new:
             return 0.0
         elif not old:
-            return 1.0
+            return +m.inf
         else:
             return (new-old) / old
 
diff --git a/scripts/perf.py b/scripts/perf.py
index a33d76c1..15e607e1 100755
--- a/scripts/perf.py
+++ b/scripts/perf.py
@@ -99,7 +99,7 @@ class RInt(co.namedtuple('RInt', 'x')):
         elif not old and not new:
             return 0.0
         elif not old:
-            return 1.0
+            return +m.inf
         else:
             return (new-old) / old
 
diff --git a/scripts/perfbd.py b/scripts/perfbd.py
index 1fc167fd..2d05914a 100755
--- a/scripts/perfbd.py
+++ b/scripts/perfbd.py
@@ -90,7 +90,7 @@ class RInt(co.namedtuple('RInt', 'x')):
         elif not old and not new:
             return 0.0
         elif not old:
-            return 1.0
+            return +m.inf
         else:
             return (new-old) / old
 
diff --git a/scripts/stack.py b/scripts/stack.py
index b4089847..faa459d8 100755
--- a/scripts/stack.py
+++ b/scripts/stack.py
@@ -81,7 +81,7 @@ class RInt(co.namedtuple('RInt', 'x')):
         elif not old and not new:
             return 0.0
         elif not old:
-            return 1.0
+            return +m.inf
         else:
             return (new-old) / old
 
diff --git a/scripts/structs.py b/scripts/structs.py
index 3d1a2129..aa91cb7c 100755
--- a/scripts/structs.py
+++ b/scripts/structs.py
@@ -86,7 +86,7 @@ class RInt(co.namedtuple('RInt', 'x')):
         elif not old and not new:
             return 0.0
         elif not old:
-            return 1.0
+            return +m.inf
         else:
             return (new-old) / old
 
diff --git a/scripts/summary.py b/scripts/summary.py
index 2b1a0c8a..e65347f8 100755
--- a/scripts/summary.py
+++ b/scripts/summary.py
@@ -106,7 +106,7 @@ class RInt(co.namedtuple('RInt', 'x')):
         elif not old and not new:
             return 0.0
         elif not old:
-            return 1.0
+            return +m.inf
         else:
             return (new-old) / old