diff --git a/sys/src/cmd/dossrv/build.json b/sys/src/cmd/dossrv/build.json
index 319ff38..38000fb 100644
--- a/sys/src/cmd/dossrv/build.json
+++ b/sys/src/cmd/dossrv/build.json
@@ -3,6 +3,10 @@
 		"Include": [
 			"../cmd.json"
 		],
+		"Cflags": [
+			"-fno-aggressive-loop-optimizations",
+			"-Wno-array-bounds"
+		],
 		"Install": "/arch/$ARCH/cmd/",
 		"Program": "dossrv",
 		"SourceFiles": [
diff --git a/sys/src/cmd/ip/build.json b/sys/src/cmd/ip/build.json
index a691cc9..73431b0 100644
--- a/sys/src/cmd/ip/build.json
+++ b/sys/src/cmd/ip/build.json
@@ -3,6 +3,9 @@
 		"Include": [
 			"/sys/src/cmd/cmd.json"
 		],
+		"Cflags": [
+			"-fno-strict-aliasing"
+		],
 		"Install": "/arch/$ARCH/cmd/ip",
 		"Projects": [
 			"dhcpd/dhcpd.json",
diff --git a/sys/src/lib/authsrv/build.json b/sys/src/lib/authsrv/build.json
index d401b33..7dbbf97 100644
--- a/sys/src/lib/authsrv/build.json
+++ b/sys/src/lib/authsrv/build.json
@@ -3,6 +3,9 @@
 		"Include": [
 			"../lib.json"
 		],
+		"Cflags": [
+			"-fno-strict-aliasing"
+		],
 		"Install": "/arch/$ARCH/lib/",
 		"Library": "libauthsrv.a",
 		"SourceFiles": [
diff --git a/sys/src/lib/memdraw/build.json b/sys/src/lib/memdraw/build.json
index d25aea8..170f138 100644
--- a/sys/src/lib/memdraw/build.json
+++ b/sys/src/lib/memdraw/build.json
@@ -3,6 +3,9 @@
 		"Include": [
 			"../lib.json"
 		],
+		"Cflags": [
+			"-fno-strict-aliasing"
+		],
 		"Install": "/arch/$ARCH/lib/",
 		"Library": "libmemdraw.a",
 		"SourceFiles": [