diff --git a/lib-src/movemail.c b/lib-src/movemail.c
index 407f95e4541..49c4bcf72db 100644
--- a/lib-src/movemail.c
+++ b/lib-src/movemail.c
@@ -97,7 +97,7 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
    [18-Feb-97 andrewi] I now believe my comment above to be incorrect,
    since it was based on a misunderstanding of how locking calls are
    implemented and used on Unix.  */
-//#define DISABLE_DIRECT_ACCESS
+/* #define DISABLE_DIRECT_ACCESS */
 
 #include <fcntl.h>
 #endif /* WINDOWSNT */
diff --git a/nt/preprep.c b/nt/preprep.c
index d1c4f2136cc..4b6fc8112bb 100644
--- a/nt/preprep.c
+++ b/nt/preprep.c
@@ -804,14 +804,14 @@ main (int argc, char **argv)
     nt_header = (PIMAGE_NT_HEADERS) ((char *) dos_header + dos_header->e_lfanew);
 
     nt_header->OptionalHeader.CheckSum = 0;
-//    nt_header->FileHeader.TimeDateStamp = time (NULL);
-//    dos_header->e_cp = size / 512;
-//    nt_header->OptionalHeader.SizeOfImage = size;
+   /* nt_header->FileHeader.TimeDateStamp = time (NULL); */
+   /* dos_header->e_cp = size / 512; */
+   /* nt_header->OptionalHeader.SizeOfImage = size; */
 
     pfnCheckSumMappedFile = (void *) GetProcAddress (hImagehelp, "CheckSumMappedFile");
     if (pfnCheckSumMappedFile)
       {
-//	nt_header->FileHeader.TimeDateStamp = time (NULL);
+	/* nt_header->FileHeader.TimeDateStamp = time (NULL); */
 	pfnCheckSumMappedFile (out_file.file_base,
 			       out_file.size,
 			       &headersum,
diff --git a/src/unexw32.c b/src/unexw32.c
index d8329be522d..f0a910781cc 100644
--- a/src/unexw32.c
+++ b/src/unexw32.c
@@ -660,14 +660,14 @@ unexec (const char *new_name, const char *old_name)
     nt_header = (PIMAGE_NT_HEADERS) ((char *) dos_header + dos_header->e_lfanew);
 
     nt_header->OptionalHeader.CheckSum = 0;
-//    nt_header->FileHeader.TimeDateStamp = time (NULL);
-//    dos_header->e_cp = size / 512;
-//    nt_header->OptionalHeader.SizeOfImage = size;
+   /* nt_header->FileHeader.TimeDateStamp = time (NULL); */
+   /* dos_header->e_cp = size / 512; */
+   /* nt_header->OptionalHeader.SizeOfImage = size; */
 
     pfnCheckSumMappedFile = (void *) GetProcAddress (hImagehelp, "CheckSumMappedFile");
     if (pfnCheckSumMappedFile)
       {
-//	nt_header->FileHeader.TimeDateStamp = time (NULL);
+	/* nt_header->FileHeader.TimeDateStamp = time (NULL); */
 	pfnCheckSumMappedFile (out_file.file_base,
 			       out_file.size,
 			       &headersum,