diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 3add92329bae..30b00de4f321 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -17,6 +17,7 @@
  */
 
 #include <stdarg.h>
+#include <linux/build_bug.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/module.h>	/* for KSYM_SYMBOL_LEN */
@@ -405,6 +406,8 @@ struct printf_spec {
 	unsigned int	base:8;		/* number base, 8, 10 or 16 only */
 	signed int	precision:16;	/* # of digits/chars */
 } __packed;
+static_assert(sizeof(struct printf_spec) == 8);
+
 #define FIELD_WIDTH_MAX ((1 << 23) - 1)
 #define PRECISION_MAX ((1 << 15) - 1)
 
@@ -422,8 +425,6 @@ char *number(char *buf, char *end, unsigned long long num,
 	int field_width = spec.field_width;
 	int precision = spec.precision;
 
-	BUILD_BUG_ON(sizeof(struct printf_spec) != 8);
-
 	/* locase = 0 or 0x20. ORing digits or letters with 'locase'
 	 * produces same digits or (maybe lowercased) letters */
 	locase = (spec.flags & SMALL);