diff --git a/main.cpp b/main.cpp
index fc7edf54..0e01ab80 100644
--- a/main.cpp
+++ b/main.cpp
@@ -60,8 +60,9 @@ int main(int argc, char *argv[]) {
 		piCout << "wrote" << wr;
 		return 0;
 	}
-	piSleep(3.);
 	PIByteArray rb(4);
+	shm.write(rb);
+	piSleep(3.);
 	int rd = shm.read(rb.data(), rb.size_s());
 	piCout << "readed" << rd << PIString(rb);