diff --git a/includes/animations.h b/includes/animations.h
index 958dc9b..68659e3 100644
--- a/includes/animations.h
+++ b/includes/animations.h
@@ -5,6 +5,7 @@
 
 #include "audio.h"
 #include "font.h"
+#include "utils.h"
 
 // Dimensions de la fenêtre
 extern GLuint _dims[];
diff --git a/includes/utils.h b/includes/utils.h
new file mode 100644
index 0000000..43f0afe
--- /dev/null
+++ b/includes/utils.h
@@ -0,0 +1,9 @@
+#ifndef DEMO_UTILS_H
+#define DEMO_UTILS_H 1
+
+#include <GL4D/gl4dummies.h>
+
+// Récupère un delta-temps
+double get_dt(void);
+
+#endif
diff --git a/src/utils.c b/src/utils.c
new file mode 100644
index 0000000..e9c181c
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,9 @@
+#include "../includes/utils.h"
+
+double get_dt(void) {
+  static double t0 = 0.0f;
+  double t = gl4dGetElapsedTime(), dt = (t - t0) / 1000.0;
+  t0 = t;
+
+  return dt;
+}