diff --git a/src/parser3.h b/src/parser3.h
index 91f7b70..053ed33 100644
--- a/src/parser3.h
+++ b/src/parser3.h
@@ -83,10 +83,7 @@ struct Parser3 {
   [[nodiscard]] WeaselJsonStatus parse(char *buf, int len);
 
   void flushNumber(bool done, char *buf) {
-    int len = 0;
-    if (dataBegin != nullptr && buf != nullptr) {
-      len = buf - dataBegin;
-    }
+    int len = (intptr_t)buf - (intptr_t)dataBegin;
     assert(len >= 0);
     if (done || len > 0) {
       callbacks->on_number_data(userdata, dataBegin ? dataBegin : "", len,
@@ -95,13 +92,11 @@ struct Parser3 {
   }
 
   void flushString(bool done, char *buf) {
-    int len = 0;
-    if (dataBegin != nullptr) {
-      if (!(flags & WeaselJsonRaw)) {
-        len = writeBuf - dataBegin;
-      } else if (buf != nullptr) {
-        len = buf - dataBegin;
-      }
+    int len;
+    if (!(flags & WeaselJsonRaw)) {
+      len = (intptr_t)writeBuf - (intptr_t)dataBegin;
+    } else {
+      len = (intptr_t)buf - (intptr_t)dataBegin;
     }
     assert(len >= 0);
     if (done || len > 0) {