diff --git a/lib/utils/mu-utils-file.cc b/lib/utils/mu-utils-file.cc
index b2b341b6..735fe2c3 100644
--- a/lib/utils/mu-utils-file.cc
+++ b/lib/utils/mu-utils-file.cc
@@ -190,7 +190,7 @@ Mu::read_from_stdin()
 	return Ok(std::string{
 			static_cast<const char*>(g_memory_output_stream_get_data(
 							 G_MEMORY_OUTPUT_STREAM(outmem))),
-			g_memory_output_stream_get_size(G_MEMORY_OUTPUT_STREAM(outmem))});
+			g_memory_output_stream_get_data_size(G_MEMORY_OUTPUT_STREAM(outmem))});
 }
 /* LCOV_EXCL_STOP*/