diff --git a/source/calculus/source/03-AD/06.ptx b/source/calculus/source/03-AD/06.ptx
index fcd8f86d9..3ecec51a3 100644
--- a/source/calculus/source/03-AD/06.ptx
+++ b/source/calculus/source/03-AD/06.ptx
@@ -30,17 +30,17 @@
       <caption>Three increasing functions</caption>
       <sidebyside widths = "30% 30% 30%">
         <image>
-            <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-increasing-concave-up.xml">
+            <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-increasing-concave-up">
                 <xi:include href="prefigure/AD6-increasing-concave-up.xml"/>
             </prefigure>
         </image>  
         <image>
-            <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-increasing-linear.xml">
+            <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-increasing-linear">
                 <xi:include href="prefigure/AD6-increasing-linear.xml"/>
             </prefigure>
         </image>  
         <image>
-            <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-increasing-concave-down.xml">
+            <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-increasing-concave-down">
                 <xi:include href="prefigure/AD6-increasing-concave-down.xml"/>
             </prefigure>
         </image>  
@@ -125,17 +125,17 @@
       <caption>From left to right, three functions that are all decreasing.</caption>
       <sidebyside widths="30% 30% 30%">
         <image>
-            <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-decreasing-concave-up.xml">
+            <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-decreasing-concave-up">
                 <xi:include href="prefigure/AD6-decreasing-concave-up.xml"/>
             </prefigure>
         </image>  
         <image>
-            <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-decreasing-linear.xml">
+            <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-decreasing-linear">
                 <xi:include href="prefigure/AD6-decreasing-linear.xml"/>
             </prefigure>
         </image>  
         <image>
-            <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-decreasing-concave-down.xml">
+            <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-decreasing-concave-down">
                 <xi:include href="prefigure/AD6-decreasing-concave-down.xml"/>
             </prefigure>
         </image>  
@@ -215,12 +215,12 @@
         <caption>Two concavities, which is which? </caption>
         <sidebyside widths="45% 45%">
             <image>
-                <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-points-concave-up.xml">
+                <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-points-concave-up">
                     <xi:include href="prefigure/AD6-points-concave-up.xml"/>
                 </prefigure>
             </image>  
             <image>
-                <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-points-concave-down.xml">
+                <prefigure xmlns="https://prefigure.org" label="prefigure-AD6-points-concave-down">
                     <xi:include href="prefigure/AD6-points-concave-down.xml"/>
                 </prefigure>
             </image>  
diff --git a/source/calculus/source/03-AD/07.ptx b/source/calculus/source/03-AD/07.ptx
index f070f9faf..7deeee13d 100644
--- a/source/calculus/source/03-AD/07.ptx
+++ b/source/calculus/source/03-AD/07.ptx
@@ -20,7 +20,7 @@
         <p>
         Which of the following features best describe the curve graphed below?  </p>
         <image>
-            <prefigure xmlns="https://prefigure.org" label="prefigure-AD7-decreasing-concave-down.xml">
+            <prefigure xmlns="https://prefigure.org" label="prefigure-AD7-decreasing-concave-down">
                 <xi:include href="prefigure/AD6-decreasing-concave-down.xml"/>
             </prefigure>
         </image>   
@@ -45,7 +45,7 @@
       <statement>
         <p> Which of the following features best describe the curve graphed below?  </p>
         <image>
-            <prefigure xmlns="https://prefigure.org" label="prefigure-AD7-increasing-concave-down.xml">
+            <prefigure xmlns="https://prefigure.org" label="prefigure-AD7-increasing-concave-down">
                 <xi:include href="prefigure/AD6-increasing-concave-down.xml"/>
             </prefigure>
         </image>