diff --git a/fuzzer.cpp b/fuzzer.cpp
index 915d655..e20f75b 100644
--- a/fuzzer.cpp
+++ b/fuzzer.cpp
@@ -16,9 +16,8 @@
 
 static std::string ToAbsolutePath(const std::string argv0, const std::string relativePath) {
     char absoluteRootPath[PATH_MAX+1];
-    char argv0Copy[argv0.size()+1];
-    memcpy(argv0Copy, argv0.c_str(), argv0.size()+1);
-    if ( realpath(dirname(argv0Copy), absoluteRootPath) == nullptr ) {
+    std::vector<char> argv0Copy(argv0.c_str(), argv0.c_str() + argv0.size() + 1);
+    if ( realpath(dirname(argv0Copy.data()), absoluteRootPath) == nullptr ) {
         printf("Fatal error: Cannot resolve absolute root path\n");
         abort();
     }