diff --git a/include/jemalloc/internal/spin_delay_arm.h b/include/jemalloc/internal/spin_delay_arm.h
index 3ea86c6c..8d5628ed 100644
--- a/include/jemalloc/internal/spin_delay_arm.h
+++ b/include/jemalloc/internal/spin_delay_arm.h
@@ -11,6 +11,7 @@ void detect_arm_sb_support(void);
 /* Use SB instruction if available, otherwise ISB */
 static inline void
 spin_delay_arm(void) {
+#ifdef HWCAP_SB
 	if (__builtin_expect(arm_has_sb_instruction == 1, 1)) {
 		/* SB instruction encoding */
 		asm volatile(".inst 0xd50330ff \n");
@@ -18,4 +19,5 @@ spin_delay_arm(void) {
 		/* ISB instruction */
 		asm volatile("isb; \n");
 	}
+#endif // HWCAP_SB
 }
diff --git a/src/spin_delay_arm.c b/src/spin_delay_arm.c
index 975023b0..2aeb37d1 100644
--- a/src/spin_delay_arm.c
+++ b/src/spin_delay_arm.c
@@ -4,11 +4,6 @@
 
 #if defined(__linux__) && (defined(__aarch64__) || defined(__arm64__))
 #include <sys/auxv.h>
-
-/* Define HWCAP_SB if not already defined in system headers */
-#ifndef HWCAP_SB
-#define HWCAP_SB (1ULL << 56) /* Speculation Barrier */
-#endif   // HWCAP_SB
 #endif   // __linux__ && (defined(__aarch64__) || defined(__arm64__))
 
 /* Global variable to track SB support, defined here to avoid multiple definitions */