diff --git a/gcc/testsuite/g++.dg/warn/unused-result1-Werror.c b/gcc/testsuite/g++.dg/warn/unused-result1-Werror.C
similarity index 100%
rename from gcc/testsuite/g++.dg/warn/unused-result1-Werror.c
rename to gcc/testsuite/g++.dg/warn/unused-result1-Werror.C