diff --git a/sf-writer/test/test_JFH5Writer.cpp b/sf-writer/test/test_JFH5Writer.cpp
index cc17170..04de282 100644
--- a/sf-writer/test/test_JFH5Writer.cpp
+++ b/sf-writer/test/test_JFH5Writer.cpp
@@ -20,7 +20,7 @@ TEST(JFH5Writer, basic_interaction)
     metadata->block_start_pulse_id = 0;
     metadata->block_stop_pulse_id = BUFFER_BLOCK_SIZE - 1;
 
-    JFH5Writer writer("ignore.h5", start_pulse_id, stop_pulse_id, n_modules, 1);
+    JFH5Writer writer("ignore.h5", n_modules, start_pulse_id, stop_pulse_id, 1);
     writer.write(metadata.get(), data.get());
 }
 
@@ -45,7 +45,6 @@ TEST(JFH5Writer, test_writing)
         metadata->is_good_image[pulse_id] = 1;
     }
 
-
     auto image_buffer = make_unique<uint16_t[]>(
             MODULE_N_PIXELS * n_modules * BUFFER_BLOCK_SIZE);
 
@@ -63,7 +62,7 @@ TEST(JFH5Writer, test_writing)
     // The writer closes the file on destruction.
     {
         JFH5Writer writer(
-                "ignore.h5", start_pulse_id, stop_pulse_id, n_modules, 1);
+                "ignore.h5", n_modules, start_pulse_id, stop_pulse_id, 1);
         writer.write(metadata.get(), (char*)(&image_buffer[0]));
     }