diff --git a/ggml.h b/ggml.h
index 4fa78a4273d82b..1ed34d0eee54ae 100644
--- a/ggml.h
+++ b/ggml.h
@@ -260,7 +260,7 @@ extern "C" {
 #elif defined(__ARM_NEON)
     typedef __fp16 ggml_fp16_t;
 #else
-    typedef uint16_t ggml_fp16_t;
+    typedef uint64_t ggml_fp16_t;
 #endif
 
     // convert FP16 <-> FP32