diff --git a/common/misc_functions.h b/common/misc_functions.h
index d5d90d98f..4f295c68a 100644
--- a/common/misc_functions.h
+++ b/common/misc_functions.h
@@ -32,8 +32,8 @@
 //
 #define VARSTRUCT_DECODE_TYPE(Type, Buffer) *(Type *)Buffer; Buffer += sizeof(Type);
 #define VARSTRUCT_DECODE_STRING(String, Buffer) strcpy(String, Buffer); Buffer += strlen(String)+1;
-#define VARSTRUCT_ENCODE_STRING(Buffer, String) { sprintf(Buffer, "%s", String); Buffer += strlen(String) + 1; }
-#define VARSTRUCT_ENCODE_INTSTRING(Buffer, Number) { sprintf(Buffer, "%i", Number); Buffer += strlen(Buffer) + 1; }
+#define VARSTRUCT_ENCODE_STRING(Buffer, String) { int length = sprintf(Buffer, "%s", String); Buffer += length + 1; }
+#define VARSTRUCT_ENCODE_INTSTRING(Buffer, Number) { int length = sprintf(Buffer, "%i", Number); Buffer += length + 1; }
 #define VARSTRUCT_ENCODE_TYPE(Type, Buffer, Value) { *(Type *)Buffer = Value; Buffer += sizeof(Type); }
 #define VARSTRUCT_SKIP_TYPE(Type, Buffer) Buffer += sizeof(Type);