diff --git a/libbpf_android/Loader.cpp b/libbpf_android/Loader.cpp
index d2a502d..7431fa2 100644
--- a/libbpf_android/Loader.cpp
+++ b/libbpf_android/Loader.cpp
@@ -554,7 +554,7 @@
         // strip any potential $foo suffix
         // this can be used to provide duplicate programs
         // conditionally loaded based on running kernel version
-        name = name.substr(0, name.find_last_of("$"));
+        name = name.substr(0, name.find_last_of('$'));
 
         bool reuse = false;
         // Format of pin location is