diff --git a/merr/merr.go b/merr/merr.go
index 16c24d8..a6b3c55 100644
--- a/merr/merr.go
+++ b/merr/merr.go
@@ -50,7 +50,7 @@ func (e Error) FullError() string {
 		sb.WriteString(": ")
 
 		// if there's no newlines then print v inline with k
-		if strings.Contains(v, "\n") {
+		if !strings.Contains(v, "\n") {
 			sb.WriteString(v)
 			continue
 		}