diff --git a/src/richtext/richtextformatdlg.cpp b/src/richtext/richtextformatdlg.cpp
index 9a03da62d9..601f3bdfde 100644
--- a/src/richtext/richtextformatdlg.cpp
+++ b/src/richtext/richtextformatdlg.cpp
@@ -691,7 +691,9 @@ bool wxRichTextFormattingDialog::ConvertFromString(const wxString& str, int& ret
         float value = 0.0;
         wxSscanf(str.c_str(), wxT("%f"), &value);
         // Convert from cm
-        ret = (int) ((value * 100.0) /* + 0.5 */);
+        // Do this in two steps, since using one step causes strange rounding error for VS 2010 at least.
+        float v = (value * 100.0);
+        ret = (int) (v);
         return true;
     }
     else if (unit == wxTEXT_ATTR_UNITS_PERCENTAGE)
@@ -703,7 +705,8 @@ bool wxRichTextFormattingDialog::ConvertFromString(const wxString& str, int& ret
     {
         float value = 0.0;
         wxSscanf(str.c_str(), wxT("%f"), &value);
-        ret = (int) ((value * 100.0) /* + 0.5 */);
+        float v = (value * 100.0);
+        ret = (int) (v);
     }
     else if (unit == wxTEXT_ATTR_UNITS_POINTS)
     {