diff --git a/src_main/core/pistring.cpp b/src_main/core/pistring.cpp
index d0fa78f2..23dc6667 100755
--- a/src_main/core/pistring.cpp
+++ b/src_main/core/pistring.cpp
@@ -94,7 +94,7 @@ PIString PIString::uitos(const uint num) {pisprintf("%u", num); return PIString(
 PIString PIString::ultos(const ulong num) {pisprintf("%lu", num); return PIString(ch);}
 PIString PIString::ulltos(const ullong num) {pisprintf("%llu", num); return PIString(ch);}
 PIString PIString::ftos(const float num, char format, int precision) {
-	char f[16] = "%.";
+	char f[8] = "%.";
 	int wr = sprintf(&(f[2]), "%d", precision);
 	f[2 + wr] = format;
 	f[3 + wr] = 0;
@@ -102,7 +102,7 @@ PIString PIString::ftos(const float num, char format, int precision) {
 	return PIString(ch);
 }
 PIString PIString::dtos(const double num, char format, int precision) {
-	char f[16] = "%.";
+	char f[8] = "%.";
 	int wr = sprintf(&(f[2]), "%d", precision);
 	f[2 + wr] = format;
 	f[3 + wr] = 0;