diff --git a/test/latexify_refs/integral1.txt b/test/latexify_refs/integral1.txt
index 3f8fa1ea0..d03e515c2 100644
--- a/test/latexify_refs/integral1.txt
+++ b/test/latexify_refs/integral1.txt
@@ -1,3 +1,3 @@
 \begin{equation}
-\int_{0}^{1)} dx x
+\int_{0}^{1)} \texttt{dx} x
 \end{equation}
diff --git a/test/latexify_refs/integral2.txt b/test/latexify_refs/integral2.txt
index 427aeff95..3e8ba3144 100644
--- a/test/latexify_refs/integral2.txt
+++ b/test/latexify_refs/integral2.txt
@@ -1,3 +1,3 @@
 \begin{equation}
-\int_{-\infty}^{\infty)} dx \left( u\left( x \right) \right)^{2}
+\int_{-\infty}^{\infty)} \texttt{dx} \left( u\left( x \right) \right)^{2}
 \end{equation}
diff --git a/test/latexify_refs/integral3.txt b/test/latexify_refs/integral3.txt
index ee9d552c6..2857cd437 100644
--- a/test/latexify_refs/integral3.txt
+++ b/test/latexify_refs/integral3.txt
@@ -1,3 +1,3 @@
 \begin{equation}
-\int_{ - z}^{u\left( x \right))} dx x^{2}
+\int_{ - z}^{u\left( x \right))} \texttt{dx} x^{2}
 \end{equation}