diff --git a/ivlpp/lexor.lex b/ivlpp/lexor.lex
index 426299fce..5c17ee205 100644
--- a/ivlpp/lexor.lex
+++ b/ivlpp/lexor.lex
@@ -1635,6 +1635,8 @@ void load_precompiled_defines(FILE* src)
 
         name = cp;
 
+	*cp++ = ch;
+
         while ((ch = fgetc(src)) != EOF && ch != ':')
             *cp++ = ch;