diff --git a/src/secp256k1/src/group.h b/src/secp256k1/src/group.h
--- a/src/secp256k1/src/group.h
+++ b/src/secp256k1/src/group.h
@@ -59,6 +59,7 @@
 /** Check whether a group element is valid (i.e., on the curve). */
 static int secp256k1_ge_is_valid_var(const secp256k1_ge *a);
 
+/** Set r equal to the inverse of a (i.e., mirrored around the X axis) */
 static void secp256k1_ge_neg(secp256k1_ge *r, const secp256k1_ge *a);
 
 /** Set a group element equal to another which is given in jacobian coordinates */
diff --git a/src/secp256k1/src/tests.c b/src/secp256k1/src/tests.c
--- a/src/secp256k1/src/tests.c
+++ b/src/secp256k1/src/tests.c
@@ -86,6 +86,7 @@
             break;
         }
     } while(1);
+    ge->infinity = 0;
 }
 
 void random_group_element_jacobian_test(secp256k1_gej *gej, const secp256k1_ge *ge) {