diff --git a/host_applications/linux/apps/dtoverlay/dtoverlay_main.c b/host_applications/linux/apps/dtoverlay/dtoverlay_main.c
index 27c7020..3279e4d 100644
--- a/host_applications/linux/apps/dtoverlay/dtoverlay_main.c
+++ b/host_applications/linux/apps/dtoverlay/dtoverlay_main.c
@@ -218,12 +218,19 @@ int main(int argc, const char **argv)
     if (!overlay_src_dir)
     {
         /* Find the overlays and README */
+        const char *os_prefix;
         int i;
 
+        /* Check for an os_prefix value */
+        os_prefix = read_file_as_string("/proc/device-tree/chosen/os_prefix",
+                                        NULL);
+        if (!os_prefix)
+            os_prefix = "";
+
         for (i = 0; boot_dirs[i]; i++)
         {
-            overlay_src_dir = sprintf_dup("%s/" OVERLAY_SRC_SUBDIR,
-                                          boot_dirs[i]);
+            overlay_src_dir = sprintf_dup("%s/%s" OVERLAY_SRC_SUBDIR,
+                                          boot_dirs[i], os_prefix);
             if (dir_exists(overlay_src_dir))
                 break;
             free_string(overlay_src_dir);
@@ -267,29 +274,8 @@ int main(int argc, const char **argv)
     }
 
     if (!platform_string)
-    {
-        FILE *fp = fopen("/proc/device-tree/compatible", "r");
-        if (fp)
-        {
-            long len;
-            long bytes_read;
-            char *prop_buf;
-
-            fseek(fp, 0, SEEK_END);
-            len = ftell(fp);
-            fseek(fp, 0, SEEK_SET);
-            prop_buf = malloc(len);
-            bytes_read = fread(prop_buf, 1, len, fp);
-            if (bytes_read == len)
-            {
-                platform_string = prop_buf;
-                platform_string_len = len;
-            }
-            else
-                fatal_error("Failed to read 'compatible' property");
-            fclose(fp);
-        }
-    }
+        platform_string = read_file_as_string("/proc/device-tree/compatible",
+                                              &platform_string_len);
 
     if (platform_string)
         dtoverlay_init_map(overlay_src_dir, platform_string, platform_string_len);
diff --git a/host_applications/linux/apps/dtoverlay/utils.c b/host_applications/linux/apps/dtoverlay/utils.c
index 511efd9..ba3c7fd 100644
--- a/host_applications/linux/apps/dtoverlay/utils.c
+++ b/host_applications/linux/apps/dtoverlay/utils.c
@@ -461,3 +461,30 @@ void fatal_error(const char *fmt, ...)
     fprintf(stderr, "\n");
     exit(1);
 }
+
+char *read_file_as_string(const char *path, int *plen)
+{
+    FILE *fp = fopen(path, "r");
+    char *string = NULL;
+    long len = 0;
+    if (fp)
+    {
+        long bytes_read;
+
+        fseek(fp, 0, SEEK_END);
+        len = ftell(fp);
+        fseek(fp, 0, SEEK_SET);
+        /* Ensure NUL-termination */
+        string = malloc(len + 1);
+        if (!string)
+            fatal_error("Out of memory", path);
+        string[len] = 0;
+        bytes_read = fread(string, 1, len, fp);
+        if (bytes_read != len)
+            fatal_error("Failed to read file '%s'", path);
+        fclose(fp);
+    }
+    if (plen)
+        *plen = (int)len;
+    return string;
+}
diff --git a/host_applications/linux/apps/dtoverlay/utils.h b/host_applications/linux/apps/dtoverlay/utils.h
index 3d3b59f..bcd8135 100644
--- a/host_applications/linux/apps/dtoverlay/utils.h
+++ b/host_applications/linux/apps/dtoverlay/utils.h
@@ -70,5 +70,6 @@ void string_vec_sort(STRING_VEC_T *vec);
 void string_vec_uninit(STRING_VEC_T *vec);
 int error(const char *fmt, ...);
 void fatal_error(const char *fmt, ...);
+char *read_file_as_string(const char *path, int *plen);
 
 #endif