diff --git a/gtsam/discrete/DecisionTreeFactor.cpp b/gtsam/discrete/DecisionTreeFactor.cpp
index c50811a506..ad4cbad434 100644
--- a/gtsam/discrete/DecisionTreeFactor.cpp
+++ b/gtsam/discrete/DecisionTreeFactor.cpp
@@ -226,7 +226,7 @@ namespace gtsam {
     stringstream ss;
 
     // Print out preamble.
-    ss << "<div>\n<table class=\'DecisionTreeFactor\'>\n  <thead>\n";
+    ss << "<div>\n<table class='DecisionTreeFactor'>\n  <thead>\n";
 
     // Print out header row.
     ss << "    <tr>";
diff --git a/gtsam/discrete/DiscreteConditional.cpp b/gtsam/discrete/DiscreteConditional.cpp
index 82018abea6..0bdc7d7b5a 100644
--- a/gtsam/discrete/DiscreteConditional.cpp
+++ b/gtsam/discrete/DiscreteConditional.cpp
@@ -396,7 +396,7 @@ string DiscreteConditional::html(const KeyFormatter& keyFormatter,
   }
 
   // Print out preamble.
-  ss << "<table class=\'DiscreteConditional\'>\n  <thead>\n";
+  ss << "<table class='DiscreteConditional'>\n  <thead>\n";
 
   // Print out header row.
   ss << "    <tr>";
diff --git a/gtsam/discrete/DiscreteValues.cpp b/gtsam/discrete/DiscreteValues.cpp
index 8a09de7425..5d0c8dd3d5 100644
--- a/gtsam/discrete/DiscreteValues.cpp
+++ b/gtsam/discrete/DiscreteValues.cpp
@@ -65,7 +65,7 @@ string DiscreteValues::html(const KeyFormatter& keyFormatter,
   stringstream ss;
 
   // Print out preamble.
-  ss << "<div>\n<table class=\'DiscreteValues\'>\n  <thead>\n";
+  ss << "<div>\n<table class='DiscreteValues'>\n  <thead>\n";
 
   // Print out header row.
   ss << "    <tr><th>Variable</th><th>value</th></tr>\n";
@@ -76,7 +76,7 @@ string DiscreteValues::html(const KeyFormatter& keyFormatter,
   // Print out all rows.
   for (const auto& kv : *this) {
     ss << "    <tr>";
-    ss << "<th>" << keyFormatter(kv.first) << "</th><td>\'"
+    ss << "<th>" << keyFormatter(kv.first) << "</th><td>"
        << Translate(names, kv.first, kv.second) << "</td>";
     ss << "</tr>\n";
   }
diff --git a/gtsam/discrete/tests/testDiscreteValues.cpp b/gtsam/discrete/tests/testDiscreteValues.cpp
index 5e7c0ac6f1..c8a1fa1680 100644
--- a/gtsam/discrete/tests/testDiscreteValues.cpp
+++ b/gtsam/discrete/tests/testDiscreteValues.cpp
@@ -57,8 +57,8 @@ TEST(DiscreteValues, htmlWithValueFormatter) {
       "    <tr><th>Variable</th><th>value</th></tr>\n"
       "  </thead>\n"
       "  <tbody>\n"
-      "    <tr><th>B</th><td>'-</td></tr>\n"
-      "    <tr><th>A</th><td>'One</td></tr>\n"
+      "    <tr><th>B</th><td>-</td></tr>\n"
+      "    <tr><th>A</th><td>One</td></tr>\n"
       "  </tbody>\n"
       "</table>\n"
       "</div>";