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diff --git a/tools/configure b/tools/configure
index 5d6d63a..b0c26b2 100755
--- a/tools/configure
+++ b/tools/configure
@@ -9,7 +9,7 @@
 #

 # global CC options for all platforms
-CCOPTS="-W -Wall -Wundef -O -nostdlib -ffreestanding -Wstrict-prototypes -pipe"
+CCOPTS="-W -Wall -Wundef -O -nostdlib -ffreestanding -Wstrict-prototypes -pipe -std=c99"

 # global LD options for all platforms
 GLOBAL_LDOPTS=""