diff --git a/src/debug/printing/printable.cpp b/src/debug/printing/printable.cpp
index 0c3bebd..5498c5b 100644
--- a/src/debug/printing/printable.cpp
+++ b/src/debug/printing/printable.cpp
@@ -15,8 +15,13 @@ namespace sta
 	{
 		va_list args;
 		va_start (args, fmt);
-		char str[2*strlen(fmt)];
-		int n = vsnprintf(str, 2*strlen(fmt), fmt, args);
+
+		char temp[1];
+		int n = vsnprintf(temp, 1, fmt, args);
+
+		va_start (args, fmt);
+		char str[n];
+		vsnprintf(str, n, fmt, args);
 		STA_ASSERT(n > 0);
 
 		println(str);