diff --git a/ChangeLog b/ChangeLog
index fc9cb11..8549ea8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -77,6 +77,9 @@ modifiers.
 in pcre2grep to the inbuilt echo facility. This may be useful in environments 
 that do not support fork().
 
+19. Fix two instances of <= 0 being applied to unsigned integers (the VMS 
+compiler complains).
+
 
 Version 10.32 10-September-2018
 -------------------------------
diff --git a/src/pcre2_convert.c b/src/pcre2_convert.c
index 1dd5c33..d45b6fe 100644
--- a/src/pcre2_convert.c
+++ b/src/pcre2_convert.c
@@ -276,7 +276,7 @@ while (plength > 0)
     break;
 
     case CHAR_BACKSLASH:
-    if (plength <= 0) return PCRE2_ERROR_END_BACKSLASH;
+    if (plength == 0) return PCRE2_ERROR_END_BACKSLASH;
     if (extended) nextisliteral = TRUE; else
       {
       if (*posix < 127 && strchr(posix_meta_escapes, *posix) != NULL)
diff --git a/src/pcre2_substitute.c b/src/pcre2_substitute.c
index bdae9e5..d404c93 100644
--- a/src/pcre2_substitute.c
+++ b/src/pcre2_substitute.c
@@ -435,7 +435,7 @@ do
 
     if (ptr >= repend)
       {
-      if (ptrstackptr <= 0) break;       /* End of replacement string */
+      if (ptrstackptr == 0) break;       /* End of replacement string */
       repend = ptrstack[--ptrstackptr];
       ptr = ptrstack[--ptrstackptr];
       continue;