diff --git a/samples/fun_call_performance.cpp b/samples/fun_call_performance.cpp
index 1c11b6ba..0a992679 100644
--- a/samples/fun_call_performance.cpp
+++ b/samples/fun_call_performance.cpp
@@ -30,9 +30,8 @@ char *mystrdup(const char *s) {
 #ifdef CHAISCRIPT_MSVC
   strcpy_s(d, len + 1, s); // Copy the characters
 #else
-  strncpy(d, s, len); // Copy the characters
+  strncpy(d, s, len + 1); // Copy the characters
 #endif
-  *std::next(d, static_cast<std::ptrdiff_t>(len)) = '\0';
   return d; // Return the new string
 }
 
diff --git a/src/libfuzzer_client.cpp b/src/libfuzzer_client.cpp
index 39ebe2f4..25726611 100644
--- a/src/libfuzzer_client.cpp
+++ b/src/libfuzzer_client.cpp
@@ -35,9 +35,8 @@ char *mystrdup(const char *s) {
 #ifdef CHAISCRIPT_MSVC
   strcpy_s(d, len + 1, s); // Copy the characters
 #else
-  strncpy(d, s, len); // Copy the characters
+  strncpy(d, s, len + 1); // Copy the characters
 #endif
-  d[len] = '\0';
   return d; // Return the new string
 }
 
diff --git a/src/main.cpp b/src/main.cpp
index d8fdb062..52db4b1d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -35,9 +35,8 @@ char *mystrdup(const char *s) {
 #ifdef CHAISCRIPT_MSVC
   strcpy_s(d, len + 1, s); // Copy the characters
 #else
-  strncpy(d, s, len); // Copy the characters
+  strncpy(d, s, len + 1); // Copy the characters
 #endif
-  *std::next(d, static_cast<std::ptrdiff_t>(len)) = '\0';
   return d; // Return the new string
 }