diff --git a/ports/stm32/sdram.c b/ports/stm32/sdram.c
index 2791df277a..514192519a 100644
--- a/ports/stm32/sdram.c
+++ b/ports/stm32/sdram.c
@@ -276,6 +276,13 @@ void sdram_leave_low_power(void) {
         (0 << 9U));                                                  // Mode Register Definition
 }
 
+#if __GNUC__ >= 11
+// Prevent array bounds warnings when accessing SDRAM_START_ADDRESS as a memory pointer.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Warray-bounds"
+#pragma GCC diagnostic ignored "-Wstringop-overflow"
+#endif
+
 bool sdram_test(bool fast) {
     uint8_t const pattern = 0xaa;
     uint8_t const antipattern = 0x55;
@@ -325,4 +332,8 @@ bool sdram_test(bool fast) {
     return true;
 }
 
+#if __GNUC__ >= 11
+#pragma GCC diagnostic pop
+#endif
+
 #endif // FMC_SDRAM_BANK