diff --git a/boards/arm/tiva/lm3s6965-ek/include/board.h b/boards/arm/tiva/lm3s6965-ek/include/board.h
index daaa45fbc41..b270f35b1ed 100644
--- a/boards/arm/tiva/lm3s6965-ek/include/board.h
+++ b/boards/arm/tiva/lm3s6965-ek/include/board.h
@@ -65,7 +65,12 @@
  */
 
 #define TIVA_SYSDIV          4
+
+#ifdef CONFIG_TIVA_WITH_QEMU
+#define SYSCLK_FREQUENCY     12500000  /* 12.5MHz */
+#else
 #define SYSCLK_FREQUENCY     50000000  /* 50MHz */
+#endif
 
 /* Peripheral Clock (PCLK)
  *