diff --git a/src/options/misfire.rs b/src/options/misfire.rs
index acba6e0..9df110b 100644
--- a/src/options/misfire.rs
+++ b/src/options/misfire.rs
@@ -95,12 +95,13 @@ impl fmt::Display for Misfire {
             InvalidOptions(ref e)            => write!(f, "{}", e),
             Help(ref text)                   => write!(f, "{}", text),
             Version(ref version)             => write!(f, "{}", version),
-            Conflict(ref a, ref b)           => write!(f, "Option {} conflicts with option {}.", a, b),
-            Duplicate(ref a, ref b)          => write!(f, "Flag {:?} conflicts with flag {:?}.", a, b),
-            Useless(ref a, false, ref b)     => write!(f, "Option {} is useless without option {}.", a, b),
-            Useless(ref a, true, ref b)      => write!(f, "Option {} is useless given option {}.", a, b),
-            Useless2(ref a, ref b1, ref b2)  => write!(f, "Option {} is useless without options {} or {}.", a, b1, b2),
-            TreeAllAll                       => write!(f, "Option --tree is useless given --all --all."),
+            Conflict(ref a, ref b)           => write!(f, "Option {} conflicts with option {}", a, b),
+            Duplicate(ref a, ref b)          => if a == b { write!(f, "Flag {} was given twice", a) }
+                                                     else { write!(f, "Flag {} conflicts with flag {}", a, b) },
+            Useless(ref a, false, ref b)     => write!(f, "Option {} is useless without option {}", a, b),
+            Useless(ref a, true, ref b)      => write!(f, "Option {} is useless given option {}", a, b),
+            Useless2(ref a, ref b1, ref b2)  => write!(f, "Option {} is useless without options {} or {}", a, b1, b2),
+            TreeAllAll                       => write!(f, "Option --tree is useless given --all --all"),
             FailedParse(ref e)               => write!(f, "Failed to parse number: {}", e),
             FailedGlobPattern(ref e)         => write!(f, "Failed to parse glob pattern: {}", e),
         }
diff --git a/xtests/error_duplicate b/xtests/error_duplicate
new file mode 100644
index 0000000..9ef8ce7
--- /dev/null
+++ b/xtests/error_duplicate
@@ -0,0 +1 @@
+Flag -l conflicts with flag --long
diff --git a/xtests/error_twice b/xtests/error_twice
new file mode 100644
index 0000000..99ef3fd
--- /dev/null
+++ b/xtests/error_twice
@@ -0,0 +1 @@
+Flag -l was given twice
diff --git a/xtests/error_useless b/xtests/error_useless
index 74fed7e..08e4e63 100644
--- a/xtests/error_useless
+++ b/xtests/error_useless
@@ -1 +1 @@
-Option --binary (-b) is useless without option --long (-l).
+Option --binary (-b) is useless without option --long (-l)
diff --git a/xtests/run.sh b/xtests/run.sh
index c5b49e2..d97cd45 100755
--- a/xtests/run.sh
+++ b/xtests/run.sh
@@ -189,6 +189,8 @@ $exa --ternary    2>&1 | diff -q - $results/error_long       || exit 1
 $exa -4           2>&1 | diff -q - $results/error_short      || exit 1
 $exa --time       2>&1 | diff -q - $results/error_value      || exit 1
 $exa --long=time  2>&1 | diff -q - $results/error_overvalued || exit 1
+$exa -l --long    2>&1 | diff -q - $results/error_duplicate  || exit 1
+$exa -ll          2>&1 | diff -q - $results/error_twice      || exit 1
 
 
 # Debug mode