diff --git a/kaleid/crtlib/sprintf.c b/kaleid/crtlib/sprintf.c
index 8174ddd..be93623 100644
--- a/kaleid/crtlib/sprintf.c
+++ b/kaleid/crtlib/sprintf.c
@@ -71,7 +71,7 @@ size_t snprintf(char *str, size_t n, const char *fmt, ...)
 }
 
 // Size of the buffer is for convertions
-#define CONVBUF 4096
+#define CONVBUF 64
 
 size_t vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
 {
@@ -82,10 +82,13 @@ size_t vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
     char mod;
     char convbuf[CONVBUF] = { 0 };
 
-    char    c;
-    int     d;
-    uint    u;
-    char   *s;
+    char c, *s;
+    int d;
+    uint u;
+
+    assert(str && fmt);
+
+    if (n == 0) return 0;
 
     // For aesthetic reasons...
     n--;
@@ -235,6 +238,7 @@ size_t vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
         }
 
         // We fallthrough here from the "while (1)"
+        lflag = hflag = hhflag = altflag = 0;
         fmt++;
     }