diff --git a/core/crypto/aes/aes_gcm.odin b/core/crypto/aes/aes_gcm.odin
index 845d7db02..ed3bb4313 100644
--- a/core/crypto/aes/aes_gcm.odin
+++ b/core/crypto/aes/aes_gcm.odin
@@ -74,6 +74,7 @@ seal_gcm :: proc(ctx: ^Context_GCM, dst, tag, iv, aad, plaintext: []byte) {
 // fails, the destination buffer will be zeroed.
 //
 // dst and plaintext MUST alias exactly or not at all.
+@(require_results)
 open_gcm :: proc(ctx: ^Context_GCM, dst, iv, aad, ciphertext, tag: []byte) -> bool {
 	assert(ctx._is_initialized)
 
diff --git a/core/crypto/chacha20poly1305/chacha20poly1305.odin b/core/crypto/chacha20poly1305/chacha20poly1305.odin
index 616525f76..ad7a510a9 100644
--- a/core/crypto/chacha20poly1305/chacha20poly1305.odin
+++ b/core/crypto/chacha20poly1305/chacha20poly1305.odin
@@ -149,6 +149,7 @@ seal :: proc(ctx: ^Context, dst, tag, iv, aad, plaintext: []byte) {
 // fails, the destination buffer will be zeroed.
 //
 // dst and plaintext MUST alias exactly or not at all.
+@(require_results)
 open :: proc(ctx: ^Context, dst, iv, aad, ciphertext, tag: []byte) -> bool {
 	plaintext := dst
 	_validate_common_slice_sizes(tag, iv, aad, ciphertext, ctx._is_xchacha)