diff --git a/src/gallium/state_trackers/clover/util/compat.hpp b/src/gallium/state_trackers/clover/util/compat.hpp
index e0ab965eee6..73055775293 100644
--- a/src/gallium/state_trackers/clover/util/compat.hpp
+++ b/src/gallium/state_trackers/clover/util/compat.hpp
@@ -361,7 +361,9 @@ namespace clover {
 
          const char *
          c_str() const {
-            return begin();
+            v.reserve(size() + 1);
+            *v.end() = 0;
+            return v.begin();
          }
 
          const char *