diff --git a/src/lib.zig b/src/lib.zig
index 6b46ce126e0b5f79647850bf4e9934d9b5f204a4..5af2dbc9efde548b598933071aba84a119e4f7c6 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -4,7 +4,7 @@ const EngineType = enum {
     sqlite3,
 };
 
-pub fn engine(etype: EngineType) type {
+pub fn engine(comptime etype: EngineType) type {
     return switch (etype) {
         .sqlite3 => @import("./sqlite3.zig"),
     };