diff --git a/common/recipes-phosphor/ipmi/phosphor-ipmi-bt.bb b/common/recipes-phosphor/ipmi/phosphor-ipmi-bt.bb
index 438e2fd..f83c873 100644
--- a/common/recipes-phosphor/ipmi/phosphor-ipmi-bt.bb
+++ b/common/recipes-phosphor/ipmi/phosphor-ipmi-bt.bb
@@ -22,5 +22,5 @@
 SRCREV="68bcce035ac7029d3110b53fb07848067da56b40"
 
 # This is how linux-libc-headers says to include custom uapi headers
-CFLAGS_append = "-I ${STAGING_KERNEL_DIR}/include/uapi"
+CFLAGS_append = " -I ${STAGING_KERNEL_DIR}/include/uapi"
 do_configure[depends] += "virtual/kernel:do_shared_workdir"
diff --git a/common/recipes-phosphor/mboxd/mboxd.bb b/common/recipes-phosphor/mboxd/mboxd.bb
index 0a55f24..9a7f716 100644
--- a/common/recipes-phosphor/mboxd/mboxd.bb
+++ b/common/recipes-phosphor/mboxd/mboxd.bb
@@ -24,7 +24,7 @@
 
 # Hacks because ${STAGING_KERNEL_DIR} points to the kernel source tree, not the
 # installed, pre-processed headers. Requires the aspeed-lpc-ctrl-h patch above.
-CFLAGS_append = "-I include"
+CFLAGS_append = " -I include"
 
 do_install_append() {
     install -d ${D}/lib/udev/rules.d