diff --git a/client/proxmark3.c b/client/proxmark3.c
index 670b9720e..b7bdb0b13 100644
--- a/client/proxmark3.c
+++ b/client/proxmark3.c
@@ -242,6 +242,7 @@ static void set_my_executable_path(void)
 			my_executable_path[path_length] = '\0';
 			my_executable_directory = (char *)malloc(dirname_length + 2);
 			strncpy(my_executable_directory, my_executable_path, dirname_length+1);
+			my_executable_directory[dirname_length+1] = '\0';
 		}
 	}
 }