diff --git a/ChangeLog b/ChangeLog
index 9b0d8aa11..a8954a215 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,6 +4,8 @@
           Sujeevan Vijayakumaran).
 - TW-1492 compiling v2.4.0 using musl(libc) (thanks to V.Krishn).
 - TW-1495 German translation for taskwarrior (thanks to Jens Erat).
+- TW-1501 Calc can't handle multi-digit numbers in some expressions (thanks to
+          Jeremy John Reeder).
 - Fixed assorted color theme problems.
 - Changed assorted reports so they do not use '.age' format for dates that are
   in the future, because those are never shown with this format (thanks to
diff --git a/src/calc.cpp b/src/calc.cpp
index 9635e02b8..9fd2882e2 100644
--- a/src/calc.cpp
+++ b/src/calc.cpp
@@ -57,7 +57,7 @@ int main (int argc, char** argv)
   try
   {
     bool infix     = true;
-    bool ambiguous = true;
+    bool ambiguous = false;
 
     // Add a source for constants.
     Eval e;
@@ -77,8 +77,8 @@ int main (int argc, char** argv)
                   << "  -d|--debug        Debug mode\n"
                   << "  -i|--infix        Infix expression (default)\n"
                   << "  -p|--postfix      Postfix expression\n"
-                  << "  -a|--ambiguous    Choose dates over numbers when ambiguous (default)\n"
-                  << "  -n|--noambiguous  Choose numbers over dates when ambiguous\n"
+                  << "  -a|--ambiguous    Choose dates over numbers when ambiguous\n"
+                  << "  -n|--noambiguous  Choose numbers over dates when ambiguous (default)\n"
                   << "\n";
         exit (1);
       }