diff --git a/rts/python/scalar.py b/rts/python/scalar.py
index 45d1044a7d..da8a6e8a75 100644
--- a/rts/python/scalar.py
+++ b/rts/python/scalar.py
@@ -990,6 +990,18 @@ def futhark_lerp64(v0, v1, t):
     return v0 + (v1 - v0) * t
 
 
+def futhark_ldexp16(x, y):
+    return np.ldexp(x, y)
+
+
+def futhark_ldexp32(x, y):
+    return np.ldexp(x, y)
+
+
+def futhark_ldexp64(x, y):
+    return np.ldexp(x, y)
+
+
 def futhark_mad16(a, b, c):
     return a * b + c