diff --git a/include/assimp/LineSplitter.h b/include/assimp/LineSplitter.h
index ef487bfc2..84a843898 100644
--- a/include/assimp/LineSplitter.h
+++ b/include/assimp/LineSplitter.h
@@ -155,7 +155,7 @@ AI_FORCE_INLINE LineSplitter::LineSplitter(StreamReaderLE& stream, bool skip_emp
         mSkip_empty_lines(skip_empty_lines),
         mTrim(trim) {
     mCur.reserve(1024);
-    mEnd = mCur.c_str() + mCur.size();
+    mEnd = mCur.c_str() + mCur.capacity();
     operator++();
     mIdx = 0;
 }
@@ -172,7 +172,7 @@ AI_FORCE_INLINE LineSplitter& LineSplitter::operator++() {
 
     char s;
     mCur.clear();
-    mEnd = mCur.c_str() + mCur.size();
+    mEnd = mCur.c_str() + mCur.capacity();
     while (mStream.GetRemainingSize() && (s = mStream.GetI1(), 1)) {
         if (s == '\n' || s == '\r') {
             if (mSkip_empty_lines) {
@@ -195,7 +195,7 @@ AI_FORCE_INLINE LineSplitter& LineSplitter::operator++() {
             break;
         }
         mCur += s;
-        mEnd = mCur.c_str() + mCur.size();
+        mEnd = mCur.c_str() + mCur.capacity();
     }
     ++mIdx;