diff --git a/tests/actions.at b/tests/actions.at
index 302c1bbb..9473f6ef 100644
--- a/tests/actions.at
+++ b/tests/actions.at
@@ -1011,7 +1011,7 @@ AT_DATA_GRAMMAR([[input]]$1[[.y]],
 start: { $$ = 'S'; } ;
 
 %%
-#include <stdlib.h> // abort
+#include <stdlib.h> /* abort */
 static int
 yylex (void)
 {
diff --git a/tests/conflicts.at b/tests/conflicts.at
index 5325b69e..7828cdf0 100644
--- a/tests/conflicts.at
+++ b/tests/conflicts.at
@@ -74,6 +74,7 @@ int main (void)
   assert (T < U);
   assert (U < V);
   assert (V < W);
+  return 0;
 }
 ]])