diff --git a/app/src/DnaStore.cpp b/app/src/DnaStore.cpp
index 2729603..86f9d2f 100644
--- a/app/src/DnaStore.cpp
+++ b/app/src/DnaStore.cpp
@@ -186,7 +186,7 @@ void client(std::string_view prefix)
   }
 
 #if defined(PLATFORM_ANDROID)
-  int ret = sprintf(buffer.data(), "%s/" ID_FILE_NAME, prefix.c_str());
+  int ret = sprintf(buffer.data(), "%s/" ID_FILE_NAME, prefix.data());
 #else
   int ret = sprintf(buffer.data(), ID_FILE_NAME);
 #endif
@@ -221,7 +221,7 @@ void client(std::string_view prefix)
     needed_gen = message.data;
 
 #if defined(PLATFORM_ANDROID)
-    int ret = sprintf(buffer.data(), "%s/" GEN_FILE_PATTRN, prefix.c_str(), needed_gen);
+    int ret = sprintf(buffer.data(), "%s/" GEN_FILE_PATTRN, prefix.data(), needed_gen);
 #else
     int ret = sprintf(buffer.data(), GEN_FILE_PATTRN, needed_gen);
 #endif