diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index 5fb17cc8c7..988abdb8a7 100644
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -536,6 +536,9 @@ AC_DEFUN([CURL_SET_COMPILER_BASIC_OPTS], [
         dnl warn about compile-time arguments used during link-time, like
         dnl -O and -g and -pedantic.
         tmp_CFLAGS="$tmp_CFLAGS -Qunused-arguments"
+        dnl Disable pointer to bool conversion warnings since they cause
+        dnl lib/securetransp.c cause several warnings for checks we want.
+        tmp_CFLAGS="$tmp_CFLAGS -Wno-pointer-bool-conversion"
         ;;
         #
       DEC_C)