diff --git a/boot/bootutil/include/bootutil/bootutil_log.h b/boot/bootutil/include/bootutil/bootutil_log.h
index 643fc99..5ca9dbd 100644
--- a/boot/bootutil/include/bootutil/bootutil_log.h
+++ b/boot/bootutil/include/bootutil/bootutil_log.h
@@ -131,6 +131,59 @@
 #endif
 
 /*
+ * When built on Mynewt, just use printf().
+ */
+#elif defined(MCUBOOT_MYNEWT)
+
+#include <stdio.h>
+
+#define BOOT_LOG_LEVEL_OFF      0
+#define BOOT_LOG_LEVEL_ERROR    1
+#define BOOT_LOG_LEVEL_WARNING  2
+#define BOOT_LOG_LEVEL_INFO     3
+#define BOOT_LOG_LEVEL_DEBUG    4
+
+#ifndef BOOT_LOG_LEVEL
+#define BOOT_LOG_LEVEL BOOT_LOG_LEVEL_INFO
+#endif
+
+#if BOOT_LOG_LEVEL >= BOOT_LOG_LEVEL_ERROR
+#define BOOT_LOG_ERR(_fmt, ...)                                         \
+    do {                                                                \
+        printf("[ERR] " _fmt "\n", ##__VA_ARGS__);                      \
+    } while (0)
+#else
+#define BOOT_LOG_ERR(...) IGNORE(__VA_ARGS__)
+#endif
+
+#if BOOT_LOG_LEVEL >= BOOT_LOG_LEVEL_WARNING
+#define BOOT_LOG_WRN(_fmt, ...)                                         \
+    do {                                                                \
+        printf("[WRN] " _fmt "\n", ##__VA_ARGS__);                      \
+    } while (0)
+#else
+#define BOOT_LOG_WRN(...) IGNORE(__VA_ARGS__)
+#endif
+
+#if BOOT_LOG_LEVEL >= BOOT_LOG_LEVEL_INFO
+#define BOOT_LOG_INF(_fmt, ...)                                         \
+    do {                                                                \
+        printf("[INF] " _fmt "\n", ##__VA_ARGS__);                      \
+    } while (0)
+#else
+#define BOOT_LOG_INF(...) IGNORE(__VA_ARGS__)
+#endif
+
+#if BOOT_LOG_LEVEL >= BOOT_LOG_LEVEL_DEBUG
+#define BOOT_LOG_DBG(_fmt, ...)                                         \
+    do {                                                                \
+        printf("[DBG] " _fmt "\n", ##__VA_ARGS__);                      \
+    } while (0)
+#else
+#define BOOT_LOG_DBG(...) IGNORE(__VA_ARGS__)
+#endif
+
+/*
  * In other environments, logging calls are no-ops.
  */
 #else  /* !defined(__BOOTSIM__) */