diff --git a/lib/libspl/include/assert.h b/lib/libspl/include/assert.h
index 9073b41f3a..7f145b89a3 100644
--- a/lib/libspl/include/assert.h
+++ b/lib/libspl/include/assert.h
@@ -65,12 +65,13 @@ extern void __assert(const char *, const char *, int);
 
 /* BEGIN CSTYLED */
 #define	VERIFY3_IMPL(LEFT, OP, RIGHT, TYPE) do { \
-	if (!((TYPE)(LEFT) OP (TYPE)(RIGHT))) { \
+	const TYPE __left = (TYPE)(LEFT); \
+	const TYPE __right = (TYPE)(RIGHT); \
+	if (!(__left OP __right)) { \
 		char *__buf = alloca(256); \
 		(void) snprintf(__buf, 256, "%s %s %s (0x%llx %s 0x%llx)", \
 			#LEFT, #OP, #RIGHT, \
-			(u_longlong_t)((TYPE)(LEFT)), #OP, \
-			(u_longlong_t)((TYPE)(RIGHT))); \
+			(u_longlong_t)__left, #OP, (u_longlong_t)__right); \
 		__assert(__buf, __FILE__, __LINE__); \
 	} \
 } while (0)