diff --git a/src/tests/mcalign-test.c b/src/tests/mcalign-test.c
index 861c38c1d..eab5dc88e 100644
--- a/src/tests/mcalign-test.c
+++ b/src/tests/mcalign-test.c
@@ -93,4 +93,6 @@ int main(PA_GCC_UNUSED int argc, PA_GCC_UNUSED char *argv[]) {
 
     if (c.memblock)
         pa_memblock_unref(c.memblock);
+
+    return 0;
 }
diff --git a/src/tests/voltest.c b/src/tests/voltest.c
index 58f1da001..4db8ef285 100644
--- a/src/tests/voltest.c
+++ b/src/tests/voltest.c
@@ -17,4 +17,6 @@ int main(PA_GCC_UNUSED int argc, PA_GCC_UNUSED char *argv[]) {
                v, (v*100)/PA_VOLUME_NORM, dB, f, pa_sw_volume_from_dB(dB), pa_sw_volume_from_linear(f));
 
     }
+
+    return 0;
 }