diff --git a/data_files/Makefile b/data_files/Makefile
index 8da980f1c..32def1ba4 100644
--- a/data_files/Makefile
+++ b/data_files/Makefile
@@ -1759,10 +1759,6 @@ ec_256_pub.comp.pem: ec_256_pub.pem
 	$(OPENSSL) ec -pubin -in $< -out $@ -conv_form compressed
 all_final += ec_256_pub.comp.pem
 
-ec_256_pub.der: ec_256_prv.sec1.der
-	$(OPENSSL) ec -in $< -outform DER -pubout -out $@
-all_final += ec_256_pub.der
-
 ec_384_pub.comp.pem: ec_384_pub.pem
 	$(OPENSSL) ec -pubin -in $< -out $@ -conv_form compressed
 all_final += ec_384_pub.comp.pem
@@ -1850,17 +1846,13 @@ ec_prv.sec1.der: ec_prv.sec1.pem
 	$(OPENSSL) pkey -in $< -out $@ -outform DER
 all_final += ec_prv.sec1.der
 
-ec_256_prv.sec1.der:
-	$(OPENSSL) ecparam -name prime256v1 -genkey -outform DER -noout -out $@
-all_final += ec_256_prv.sec1.der
+ec_256_prv.der: ec_256_prv.pem
+	$(OPENSSL) pkey -in $< -out $@ -outform DER
+all_final += ec_256_prv.pem
 
-ec_256_prv.sec1.pem: ec_256_prv.sec1.der
-	$(OPENSSL) ec -in $< -out $@ -outform PEM
-all_final += ec_256_prv.sec1.pem
-
-ec_256_prv.sec1.comp.pem: ec_256_prv.sec1.der
-	$(OPENSSL) ec -in $< -conv_form compressed -outform PEM -out $@
-all_final += ec_256_prv.sec1.comp.pem
+ec_256_pub.der: ec_256_prv.pem
+	$(OPENSSL) pkey -in $< -outform DER -pubout -out $@
+all_final += ec_256_pub.der
 
 ec_256_long_prv.der: ec_256_long_prv.pem
 	$(OPENSSL) pkey -in $< -out $@ -outform DER
diff --git a/data_files/ec_256_prv.der b/data_files/ec_256_prv.der
new file mode 100644
index 000000000..e65d3cd65
Binary files /dev/null and b/data_files/ec_256_prv.der differ
diff --git a/data_files/ec_256_prv.sec1.der b/data_files/ec_256_prv.sec1.der
deleted file mode 100644
index e1da3985b..000000000
Binary files a/data_files/ec_256_prv.sec1.der and /dev/null differ
diff --git a/data_files/ec_256_pub.der b/data_files/ec_256_pub.der
index 91056e4b5..2ba259538 100644
Binary files a/data_files/ec_256_pub.der and b/data_files/ec_256_pub.der differ