diff --git a/src/string.cpp b/src/string.cpp
index 6fb47aa..d1ba8ae 100644
--- a/src/string.cpp
+++ b/src/string.cpp
@@ -255,7 +255,12 @@ istring& istring::operator+=(const string_view& str) {
 }
 
 istring& istring::operator+=(char ch) {
-	return append(1, ch);
+	if (m_size < m_capacity) {
+		m_str[m_size] = ch;
+		++m_size;
+	}
+	
+	return *this;
 }
 
 istring& istring::replace(size_t pos, size_t count, const string_view& str) {