diff --git a/pretext/pretext.py b/pretext/pretext.py
index ed4c736e5..b7026cf2d 100755
--- a/pretext/pretext.py
+++ b/pretext/pretext.py
@@ -3137,10 +3137,12 @@ def epub(xml_source, pub_file, out_file, dest_dir, math_format, stringparams):
     # All styles are baked into one of these two files
     if math_format == "kindle":
         css = os.path.join(get_ptx_xsl_path(), "..", "css", "dist", "kindle.css")
-        shutil.copy2(css, css_dir)
+        css_map = os.path.join(get_ptx_xsl_path(), "..", "css", "dist", "kindle.css.map")
     if math_format == "svg":
         css = os.path.join(get_ptx_xsl_path(), "..", "css", "dist", "epub.css")
-        shutil.copy2(css, css_dir)
+        css_map = os.path.join(get_ptx_xsl_path(), "..", "css", "dist", "epub.css.map")
+    shutil.copy2(css, css_dir)
+    shutil.copy2(css_map, css_dir)
 
     # EPUB Cover File
 
diff --git a/xsl/pretext-epub.xsl b/xsl/pretext-epub.xsl
index 8fb250940..b5f91849b 100644
--- a/xsl/pretext-epub.xsl
+++ b/xsl/pretext-epub.xsl
@@ -442,9 +442,11 @@
         <xsl:choose>
             <xsl:when test="$b-kindle">
                 <item id="css-kindle" href="{$css-dir}/kindle.css"            media-type="text/css"/>
+                <item id="css-kindle-map" href="{$css-dir}/kindle.css.map"            media-type="text/css"/>
             </xsl:when>
             <xsl:otherwise>
                 <item id="css-epub" href="{$css-dir}/epub.css"            media-type="text/css"/>
+                <item id="css-epub-map" href="{$css-dir}/epub.css.map"            media-type="text/css"/>
             </xsl:otherwise>
         </xsl:choose>
         <item id="cover-page" href="{$xhtml-dir}/cover-page.xhtml" media-type="application/xhtml+xml"/>