diff --git a/docs/lexicon.html b/docs/lexicon.html
index ba838f200..d49528faa 100644
--- a/docs/lexicon.html
+++ b/docs/lexicon.html
@@ -418,7 +418,7 @@ <h3 class="title-3">
             ><span class="fn-arg">width</span>[,
             <span class="fn-arg">fillchar</span>]<span class="fn-p">)</span></code
           >
-          - returns a copy of this string left-padded with the character given
+          - returns a copy of this string right-padded with the character given
           in <code class="code">fillchar</code> (or the default <code class="code"
           >' '</code> if no value is given) until it is  <code class="code"
           >width</code> characters long.
@@ -431,7 +431,7 @@ <h3 class="title-3">
             ><span class="fn-arg">width</span>[,
             <span class="fn-arg">fillchar</span>]<span class="fn-p">)</span></code
           >
-          - returns a copy of this string right-padded with the character given
+          - returns a copy of this string left-padded with the character given
           in <code class="code">fillchar</code> (or the default <code class="code"
           >' '</code> if no value is given) until it is  <code class="code"
           >width</code> characters long.
diff --git a/src/parse/asp/builtins.go b/src/parse/asp/builtins.go
index 67f3d5cea..f6c2a2ef3 100644
--- a/src/parse/asp/builtins.go
+++ b/src/parse/asp/builtins.go
@@ -569,9 +569,9 @@ func strJust(s *scope, args []pyObject, left bool) pyObject {
 		return pyString(self)
 	}
 	if left {
-		return pyString(strings.Repeat(fillchar, count) + self)
+		return pyString(self + strings.Repeat(fillchar, count))
 	}
-	return pyString(self + strings.Repeat(fillchar, count))
+	return pyString(strings.Repeat(fillchar, count) + self)
 }
 
 func strLStrip(s *scope, args []pyObject) pyObject {
diff --git a/src/parse/asp/interpreter_test.go b/src/parse/asp/interpreter_test.go
index aed64561c..511f00b05 100644
--- a/src/parse/asp/interpreter_test.go
+++ b/src/parse/asp/interpreter_test.go
@@ -734,16 +734,16 @@ func TestBreakLoop(t *testing.T) {
 func TestStrLjust(t *testing.T) {
 	s, err := parseFile("src/parse/asp/test_data/interpreter/str/ljust.build")
 	assert.NoError(t, err)
-	assert.EqualValues(t, pyString("   kittens"), s.Lookup("s1"))
-	assert.EqualValues(t, pyString("+++kittens"), s.Lookup("s2"))
+	assert.EqualValues(t, pyString("kittens   "), s.Lookup("s1"))
+	assert.EqualValues(t, pyString("kittens+++"), s.Lookup("s2"))
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("s3"))
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("s4"))
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("s5"))
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("s6"))
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("s7"))
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("s8"))
-	assert.EqualValues(t, pyString("£££kittens"), s.Lookup("s9"))
-	assert.EqualValues(t, pyString("++++££kittens££"), s.Lookup("s10"))
+	assert.EqualValues(t, pyString("kittens£££"), s.Lookup("s9"))
+	assert.EqualValues(t, pyString("££kittens££++++"), s.Lookup("s10"))
 	// Make sure the original string wasn't modified:
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("orig"))
 
@@ -754,16 +754,16 @@ func TestStrLjust(t *testing.T) {
 func TestStrRjust(t *testing.T) {
 	s, err := parseFile("src/parse/asp/test_data/interpreter/str/rjust.build")
 	assert.NoError(t, err)
-	assert.EqualValues(t, pyString("kittens   "), s.Lookup("s1"))
-	assert.EqualValues(t, pyString("kittens+++"), s.Lookup("s2"))
+	assert.EqualValues(t, pyString("   kittens"), s.Lookup("s1"))
+	assert.EqualValues(t, pyString("+++kittens"), s.Lookup("s2"))
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("s3"))
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("s4"))
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("s5"))
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("s6"))
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("s7"))
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("s8"))
-	assert.EqualValues(t, pyString("kittens£££"), s.Lookup("s9"))
-	assert.EqualValues(t, pyString("££kittens££++++"), s.Lookup("s10"))
+	assert.EqualValues(t, pyString("£££kittens"), s.Lookup("s9"))
+	assert.EqualValues(t, pyString("++++££kittens££"), s.Lookup("s10"))
 	// Make sure the original string wasn't modified:
 	assert.EqualValues(t, pyString("kittens"), s.Lookup("orig"))