diff --git a/fips.go b/fips.go
index 82705de..dcb6a5b 100644
--- a/fips.go
+++ b/fips.go
@@ -94,4 +94,8 @@ func init() {
     }
     Wc_SetDefaultFips_Cb()
     Wc_SetDefaultSeed_Cb()
+
+    if ret := Wc_RunAllCast_fips(); ret != 0 && ret != -174 {
+        panic(fmt.Sprintf("wolfSSL: wc_RunAllCast_fips failed: %d CAST(s) failed", ret))
+    }
 }