diff --git a/tests/suite1-main.cc b/tests/suite1-main.cc
index ecff6236d..40ccba247 100644
--- a/tests/suite1-main.cc
+++ b/tests/suite1-main.cc
@@ -3,6 +3,7 @@
 #include <bse/bsemain.hh>
 #include <bse/bse.hh>
 #include "ipc.hh"
+#include "testresampler.hh"
 
 #define DEBUG(...)              do { break; Bse::printerr (__VA_ARGS__); } while (0)
 
@@ -188,14 +189,11 @@ main (int argc, char *argv[])
       bench_aida();
       return 0;
     }
-  /* NEVER inline prototypes, ALWAYS use a header file!
-   *  if (argc >= 2 && argv[1] && std::string ("--resampler") == argv[1])
-   *    {
-   *      Bse::init_async (&argc, argv, argv[0], args);
-   *      extern int test_resampler (int, char **);
-   *      return test_resampler (argc, argv);
-   *    }
-   */
+  if (argc >= 2 && argv[1] && std::string ("--resampler") == argv[1])
+    {
+      Bse::init_async (&argc, argv, argv[0], args);
+      return test_resampler (argc, argv);
+    }
   // run tests
   return bse_init_and_test (&argc, argv, [&]() { return test_main (argc, argv); }, args);
 }
diff --git a/tests/testresampler.cc b/tests/testresampler.cc
index 1158a1f26..18e31b311 100644
--- a/tests/testresampler.cc
+++ b/tests/testresampler.cc
@@ -6,6 +6,7 @@
 #include <bse/bsemathsignal.hh>
 #include <bse/gslfft.hh>
 #include "bse/internal.hh"
+#include "testresampler.hh"
 #include <stdio.h>
 #include <math.h>
 #include <sys/time.h>
@@ -904,8 +905,6 @@ TEST_PERF (testresampler_check_performance_sub24);
 static void testresampler_check_performance_over24()    { run_perf (RES_OVERSAMPLE, 24); }
 TEST_PERF (testresampler_check_performance_over24);
 
-int test_resampler (int argc, char **argv);
-
 int
 test_resampler (int argc, char **argv)
 {
diff --git a/tests/testresampler.hh b/tests/testresampler.hh
new file mode 100644
index 000000000..39364212d
--- /dev/null
+++ b/tests/testresampler.hh
@@ -0,0 +1,7 @@
+// Licensed GNU LGPL v2.1 or later: http://www.gnu.org/licenses/lgpl.html
+#ifndef __TEST_RESAMPLER_HH__
+#define __TEST_RESAMPLER_HH__
+
+int test_resampler (int argc, char **argv);
+
+#endif