diff --git a/.travis.yml b/.travis.yml
index f58ea7b..a1f56f6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,6 +14,7 @@ install:
 
 # Travis does not support FUSE, so we can't just run "go test ./..."
 script:
+  - openssl version
   - go build
   - ./build.bash
   - go test ./internal/...
diff --git a/internal/stupidgcm/stupidgcm.go b/internal/stupidgcm/stupidgcm.go
index 6773a35..f92bc01 100644
--- a/internal/stupidgcm/stupidgcm.go
+++ b/internal/stupidgcm/stupidgcm.go
@@ -147,7 +147,7 @@ func (g stupidGCM) Open(dst, iv, in, authData []byte) ([]byte, error) {
 	// Provide authentication data
 	var resultLen C.int
 	if C.EVP_DecryptUpdate(ctx, nil, &resultLen, (*C.uchar)(&authData[0]), C.int(len(authData))) != 1 {
-		log.Panic("EVP_EncryptUpdate authData failed")
+		log.Panic("EVP_DecryptUpdate authData failed")
 	}
 	if int(resultLen) != len(authData) {
 		log.Panicf("Unexpected length %d", resultLen)