diff --git a/extra/math/derivatives/derivatives.factor b/extra/math/derivatives/derivatives.factor
index 3e62e7d192..9d74bdc750 100644
--- a/extra/math/derivatives/derivatives.factor
+++ b/extra/math/derivatives/derivatives.factor
@@ -10,14 +10,14 @@ M: undefined-derivative summary
     " is undefined at " % point>> # "." % ]
     "" make ;
 
-DERIVATIVE: + [ 2drop ] [ 2drop ]
-DERIVATIVE: - [ 2drop ] [ 2drop neg ]
-DERIVATIVE: * [ nip * ] [ drop * ]
-DERIVATIVE: / [ nip / ] [ sq / neg * ]
+DERIVATIVE: + [ 2drop ] [ 2drop ] ;
+DERIVATIVE: - [ 2drop ] [ 2drop neg ] ;
+DERIVATIVE: * [ nip * ] [ drop * ] ;
+DERIVATIVE: / [ nip / ] [ sq / neg * ] ;
 ! Conditional checks if the epsilon-part of the exponent is
 ! 0 to avoid getting float answers for integer powers.
 DERIVATIVE: ^ [ [ 1 - ^ ] keep * * ]
-    [ [ dup zero? ] 2dip [ 3drop 0 ] [ [ ^ ] keep log * * ] if ]
+    [ [ dup zero? ] 2dip [ 3drop 0 ] [ [ ^ ] keep log * * ] if ] ;
 
 DERIVATIVE: abs
     [ 0 <=>
@@ -26,28 +26,28 @@ DERIVATIVE: abs
             { +eq+ [ 0 \ abs undefined-derivative ] }
             { +gt+ [ ] }
         } case
-    ]
+    ] ;
 
-DERIVATIVE: sqrt [ sqrt 2 * / ]
+DERIVATIVE: sqrt [ sqrt 2 * / ] ;
 
-DERIVATIVE: e^ [ e^ * ]
-DERIVATIVE: log [ / ]
+DERIVATIVE: e^ [ e^ * ] ;
+DERIVATIVE: log [ / ] ;
 
-DERIVATIVE: sin [ cos * ]
-DERIVATIVE: cos [ sin neg * ]
-DERIVATIVE: tan [ sec sq * ]
+DERIVATIVE: sin [ cos * ] ;
+DERIVATIVE: cos [ sin neg * ] ;
+DERIVATIVE: tan [ sec sq * ] ;
 
-DERIVATIVE: sinh [ cosh * ]
-DERIVATIVE: cosh [ sinh * ]
-DERIVATIVE: tanh [ sech sq * ]
+DERIVATIVE: sinh [ cosh * ] ;
+DERIVATIVE: cosh [ sinh * ] ;
+DERIVATIVE: tanh [ sech sq * ] ;
 
-DERIVATIVE: asin [ sq neg 1 + sqrt / ]
-DERIVATIVE: acos [ sq neg 1 + sqrt neg / ]
-DERIVATIVE: atan [ sq 1 + / ]
+DERIVATIVE: asin [ sq neg 1 + sqrt / ] ;
+DERIVATIVE: acos [ sq neg 1 + sqrt neg / ] ;
+DERIVATIVE: atan [ sq 1 + / ] ;
 
-DERIVATIVE: asinh [ sq 1 + sqrt / ]
-DERIVATIVE: acosh [ [ 1 + sqrt ] [ 1 - sqrt ] bi * / ]
-DERIVATIVE: atanh [ sq neg 1 + / ]
+DERIVATIVE: asinh [ sq 1 + sqrt / ] ;
+DERIVATIVE: acosh [ [ 1 + sqrt ] [ 1 - sqrt ] bi * / ] ;
+DERIVATIVE: atanh [ sq neg 1 + / ] ;
 
-DERIVATIVE: neg [ drop neg ]
-DERIVATIVE: recip [ sq recip neg * ]
+DERIVATIVE: neg [ drop neg ] ;
+DERIVATIVE: recip [ sq recip neg * ] ;
diff --git a/extra/math/derivatives/syntax/syntax.factor b/extra/math/derivatives/syntax/syntax.factor
index 077c3ac1b0..b1d33a80c1 100644
--- a/extra/math/derivatives/syntax/syntax.factor
+++ b/extra/math/derivatives/syntax/syntax.factor
@@ -1,10 +1,9 @@
 ! Copyright (C) 2009 Jason W. Merrill.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: kernel parser words effects accessors sequences
-    math.ranges ;
-
+USING: accessors effects kernel lexer math.ranges parser
+sequences words ;
 IN: math.derivatives.syntax
 
 SYNTAX: DERIVATIVE: scan-object dup stack-effect in>> length [1,b]
-    [ drop scan-object ] map
+    [ drop scan-object ] map ";" expect
     "derivative" set-word-prop ;