diff --git a/src/shared_library.c b/src/shared_library.c
index e450c877..9bdfc7a2 100644
--- a/src/shared_library.c
+++ b/src/shared_library.c
@@ -177,7 +177,7 @@ rcutils_load_shared_library(
       continue;
     }
     lib->library_path = lib->allocator.reallocate(
-      buffer, buffer_size, lib->allocator.state);
+      buffer, buffer_size + 1, lib->allocator.state);
     if (NULL == lib->library_path) {
       lib->library_path = buffer;
     }