diff --git a/include/tinycrypt/ecc.h b/include/tinycrypt/ecc.h
index 2da74b3c0a..9a705c495b 100644
--- a/include/tinycrypt/ecc.h
+++ b/include/tinycrypt/ecc.h
@@ -83,6 +83,13 @@
 extern "C" {
 #endif
 
+/* Return values for functions, chosen with large Hamming distances between
+ * them (especially to SUCESS) to mitigate the impact of fault injection
+ * attacks flipping a low number of bits. */
+#define UECC_SUCCESS            0
+#define UECC_FAILURE            0x75555555
+#define UECC_ATTACK_DETECTED    0x7aaaaaaa
+
 /* Word size (4 bytes considering 32-bits architectures) */
 #define uECC_WORD_SIZE 4