diff --git a/examples/hello-web/platform/host.zig b/examples/hello-web/platform/host.zig
index bfd519e9de..250aac40e0 100644
--- a/examples/hello-web/platform/host.zig
+++ b/examples/hello-web/platform/host.zig
@@ -30,7 +30,7 @@ export fn roc_alloc(size: usize, alignment: u32) callconv(.C) ?*c_void {
     return malloc(size);
 }
 
-export fn roc_realloc(c_ptr: *c_void, old_size: usize, new_size: usize, alignment: u32) callconv(.C) ?*c_void {
+export fn roc_realloc(c_ptr: *c_void, new_size: usize, old_size: usize, alignment: u32) callconv(.C) ?*c_void {
     _ = old_size;
     _ = alignment;
 
diff --git a/examples/hello-world/platform/host.c b/examples/hello-world/platform/host.c
index 99ada123fe..8607bf1cbb 100644
--- a/examples/hello-world/platform/host.c
+++ b/examples/hello-world/platform/host.c
@@ -7,7 +7,7 @@
 
 void* roc_alloc(size_t size, unsigned int alignment) { return malloc(size); }
 
-void* roc_realloc(void* ptr, size_t old_size, size_t new_size,
+void* roc_realloc(void* ptr, size_t new_size, size_t old_size,
                   unsigned int alignment) {
   return realloc(ptr, new_size);
 }