diff --git a/core/fpu.c b/core/fpu.c
index a1720ad..79a0047 100644
--- a/core/fpu.c
+++ b/core/fpu.c
@@ -3289,7 +3289,7 @@ void inst_fpu_other () {
 void fpu_initialize()
 {
     fpu_state_t *fpu = (fpu_state_t*)p_alloc(shoe.pool, sizeof(fpu_state_t));
-    memset(fpu, sizeof(fpu_state_t), 0);
+    memset(fpu, 0, sizeof(fpu_state_t));
     shoe.fpu_state = fpu;
 }