diff --git a/cmake/toolchain/xcc.cmake b/cmake/toolchain/xcc.cmake
index 56caa3fe261..15fc7fe1b6f 100644
--- a/cmake/toolchain/xcc.cmake
+++ b/cmake/toolchain/xcc.cmake
@@ -15,4 +15,12 @@ set(OPTIMIZE_FOR_DEBUG_FLAG "-O0")
 set(CC xcc)
 set(C++ xc++)
 
+set(NOSYSDEF_CFLAG "")
+
 list(APPEND TOOLCHAIN_C_FLAGS -fms-extensions)
+
+# xcc doesn't have this, so we need to define it here.
+# This is the same as in the xcc toolchain spec files.
+list(APPEND TOOLCHAIN_C_FLAGS
+  -D__SIZEOF_LONG__=4
+  )
diff --git a/soc/xtensa/intel_s1000/soc.c b/soc/xtensa/intel_s1000/soc.c
index 8eb6de31033..f4416d80090 100644
--- a/soc/xtensa/intel_s1000/soc.c
+++ b/soc/xtensa/intel_s1000/soc.c
@@ -11,6 +11,8 @@
 #include <xtensa/hal.h>
 #include <init.h>
 
+#include "soc.h"
+
 #define LOG_LEVEL CONFIG_SOC_LOG_LEVEL
 #include <logging/log.h>
 LOG_MODULE_REGISTER(soc);