diff --git a/flashrom.c b/flashrom.c
index c9c7e31..113a05b 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -28,6 +28,7 @@
 #include <sys/stat.h>
 #endif
 #include <string.h>
+#include <unistd.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <ctype.h>
@@ -1255,36 +1256,36 @@
 	msg_gerr("Error: No file I/O support in libpayload\n");
 	return 1;
 #else
-	unsigned long numbytes;
-	FILE *image;
-	struct stat image_stat;
+	int ret = 0;
 
+	FILE *image;
 	if ((image = fopen(filename, "rb")) == NULL) {
 		msg_gerr("Error: opening file \"%s\" failed: %s\n", filename, strerror(errno));
 		return 1;
 	}
+
+	struct stat image_stat;
 	if (fstat(fileno(image), &image_stat) != 0) {
 		msg_gerr("Error: getting metadata of file \"%s\" failed: %s\n", filename, strerror(errno));
-		fclose(image);
-		return 1;
+		ret = 1;
+		goto out;
 	}
 	if (image_stat.st_size != size) {
 		msg_gerr("Error: Image size (%jd B) doesn't match the flash chip's size (%lu B)!\n",
 			 (intmax_t)image_stat.st_size, size);
-		fclose(image);
-		return 1;
+		ret = 1;
+		goto out;
 	}
-	numbytes = fread(buf, 1, size, image);
-	if (fclose(image)) {
-		msg_gerr("Error: closing file \"%s\" failed: %s\n", filename, strerror(errno));
-		return 1;
-	}
+
+	unsigned long numbytes = fread(buf, 1, size, image);
 	if (numbytes != size) {
 		msg_gerr("Error: Failed to read complete file. Got %ld bytes, "
 			 "wanted %ld!\n", numbytes, size);
-		return 1;
+		ret = 1;
 	}
-	return 0;
+out:
+	(void)fclose(image);
+	return ret;
 #endif
 }
 
@@ -1294,8 +1295,8 @@
 	msg_gerr("Error: No file I/O support in libpayload\n");
 	return 1;
 #else
-	unsigned long numbytes;
 	FILE *image;
+	int ret = 0;
 
 	if (!filename) {
 		msg_gerr("No filename specified.\n");
@@ -1306,14 +1307,37 @@
 		return 1;
 	}
 
-	numbytes = fwrite(buf, 1, size, image);
-	fclose(image);
+	unsigned long numbytes = fwrite(buf, 1, size, image);
 	if (numbytes != size) {
-		msg_gerr("File %s could not be written completely.\n",
-			 filename);
-		return 1;
+		msg_gerr("Error: file %s could not be written completely.\n", filename);
+		ret = 1;
+		goto out;
 	}
-	return 0;
+	if (fflush(image)) {
+		msg_gerr("Error: flushing file \"%s\" failed: %s\n", filename, strerror(errno));
+		ret = 1;
+	}
+	// Try to fsync() only regular files and if that function is available at all (e.g. not on MinGW).
+#if defined(_POSIX_FSYNC) && (_POSIX_FSYNC != -1)
+	struct stat image_stat;
+	if (fstat(fileno(image), &image_stat) != 0) {
+		msg_gerr("Error: getting metadata of file \"%s\" failed: %s\n", filename, strerror(errno));
+		ret = 1;
+		goto out;
+	}
+	if (S_ISREG(image_stat.st_mode)) {
+		if (fsync(fileno(image))) {
+			msg_gerr("Error: fsyncing file \"%s\" failed: %s\n", filename, strerror(errno));
+			ret = 1;
+		}
+	}
+#endif
+out:
+	if (fclose(image)) {
+		msg_gerr("Error: closing file \"%s\" failed: %s\n", filename, strerror(errno));
+		ret = 1;
+	}
+	return ret;
 #endif
 }