diff --git a/SoC/evalsoc/Common/npk.yml b/SoC/evalsoc/Common/npk.yml
index 9903c8a8..7eef152d 100644
--- a/SoC/evalsoc/Common/npk.yml
+++ b/SoC/evalsoc/Common/npk.yml
@@ -168,10 +168,10 @@ buildconfig:
         condition: $( ${stdclib} == "nostd" )
       - flags:
         condition: $( ${stdclib} == "nospec" )
-      - flags: -isystem=/include/libncrt
+      - flags: -isystem /include/libncrt
         condition: $( startswith(${stdclib}, "libncrt") )
       # For newlib nano, use system include newlib-nano
-      - flags: -isystem=/include/newlib-nano
+      - flags: -isystem /include/newlib-nano
         condition: $( startswith(${stdclib}, "newlib") && ${stdclib} != "newlib_full" )
     ldflags:
       - flags: -nostartfiles -nodefaultlibs