test: data: fix makefile error

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 9fed16e..2480f60 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -906,7 +906,7 @@
 
 ec_384_pub.comp.pem: ec_384_pub.pem
 	$(OPENSSL) ec -pubin -in $< -out $@ -conv_form compressed
-all_final += ec_256_pub.comp.pem
+all_final += ec_384_pub.comp.pem
 
 ec_521_pub.comp.pem: ec_521_pub.pem
 	$(OPENSSL) ec -pubin -in $< -out $@ -conv_form compressed