diff --git a/lib/generate_functions.py b/lib/generate_functions.py
index d31c9c3..4e965f5 100644
--- a/lib/generate_functions.py
+++ b/lib/generate_functions.py
@@ -13,6 +13,8 @@ def c_to_zig_type(t: str) -> str:
     t = t.replace("const ", "")
     if t == "float":
         t = "f32"
+    if t == "double":
+        t = "f64"
     if t == "int":
         t = "c_int"
     if t == "unsigned int":