diff --git a/CMakeLists.txt b/CMakeLists.txt
index 14b90e19d..c897ea581 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -193,6 +193,8 @@ set(OLIVE_SOURCES
   global/math.h
   global/path.cpp
   global/path.h
+  global/rational.h
+  global/rational.cpp
   global/timing.cpp
   global/timing.h
   nodes/inputs/boolinput.cpp
diff --git a/global/rational.cpp b/global/rational.cpp
new file mode 100644
index 000000000..66fc7b288
--- /dev/null
+++ b/global/rational.cpp
@@ -0,0 +1,2 @@
+#include "rational.h"
+
diff --git a/global/rational.h b/global/rational.h
new file mode 100644
index 000000000..b02b0caca
--- /dev/null
+++ b/global/rational.h
@@ -0,0 +1,14 @@
+#ifndef RATIONAL_H
+#define RATIONAL_H
+
+#include <libavformat/avformat.h>
+
+namespace olive {
+  /**
+   * Rational type for timeline values. Currently we just use FFmpeg's AVRational for ease but we can change this
+   * later if we want.
+   */
+  using rational = AVRational;
+};
+
+#endif // RATIONAL_H