diff --git a/src/headers/parsing/Parser.hpp b/src/headers/parsing/Parser.hpp
index 4ce100b..53b1d3b 100644
--- a/src/headers/parsing/Parser.hpp
+++ b/src/headers/parsing/Parser.hpp
@@ -45,7 +45,7 @@ namespace Parser {
             switch (current.toktype) {
                 case NUMBER: {
                     long double v = stoul(current.toktext);
-                    if (i > 0 && lexed[i - 1].toktype == HYPHEN) v = -v;
+                    if (i != 0 && lexed[i - 1].toktype == HYPHEN) v = -v;
                     types::Integer::precision_type p = 0;
                     if (nextAre({DOT, NUMBER})) {
                         i += 2;