diff --git a/m4/virt-compile-warnings.m4 b/m4/virt-compile-warnings.m4
index 574fbc433e16addf22cb00eee02981071659c7a7..fb82238cf9d2a9927a6b4c7b6a0bf1893aa53780 100644
--- a/m4/virt-compile-warnings.m4
+++ b/m4/virt-compile-warnings.m4
@@ -119,9 +119,6 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
     # ideally we'd turn many of them on
     dontwarn="$dontwarn -Wfloat-equal"
     dontwarn="$dontwarn -Wdeclaration-after-statement"
-    dontwarn="$dontwarn -Wcast-qual"
-    dontwarn="$dontwarn -Wconversion"
-    dontwarn="$dontwarn -Wsign-conversion"
     dontwarn="$dontwarn -Wpacked"
     dontwarn="$dontwarn -Wunused-macros"
     dontwarn="$dontwarn -Woverlength-strings"