diff --git a/build.sh b/build.sh
index 0003551..8f5de7e 100755
--- a/build.sh
+++ b/build.sh
@@ -14,8 +14,8 @@ rm -rf $DIR/server
 git clone --branch "v${BW_VERSION}" --depth 1 https://github.com/bitwarden/server.git $DIR/server
 
 # Replace certificate file and thumbprint
-old_thumbprint=$(openssl x509 -fingerprint -noout -in $DIR/server/src/Core/licensing.cer | cut -d= -f2 | tr -d ':')
-new_thumbprint=$(openssl x509 -fingerprint -noout -in $DIR/.keys/cert.cert | cut -d= -f2 | tr -d ':')
+old_thumbprint=$(openssl x509 -inform DER -fingerprint -noout -in $DIR/server/src/Core/licensing.cer | cut -d= -f2 | tr -d ':')
+new_thumbprint=$(openssl x509 -inform DER -fingerprint -noout -in $DIR/.keys/cert.cert | cut -d= -f2 | tr -d ':')
 sed -i -e "s/$old_thumbprint/$new_thumbprint/g" $DIR/server/src/Core/Services/Implementations/LicensingService.cs
 cp $DIR/.keys/cert.cert $DIR/server/src/Core/licensing.cer