diff --git a/DESCRIPTION b/DESCRIPTION
index 84171ca..5cb3576 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: parseLatex
 Type: Package
 Title: Parse 'LaTeX' Code
-Version: 0.4.2
+Version: 0.4.3
 Authors@R: c(
     person(
       "Duncan", "Murdoch",
diff --git a/NEWS.md b/NEWS.md
index b969d65..44ba426 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,6 +1,7 @@
-# parseLatex 0.4.2
+# parseLatex 0.4.3
 
 * Improved support for syntax of `\let` and `\def`.
+* Fixed error in C code as requested by CRAN.
 
 # parseLatex 0.4.1
 
diff --git a/src/gramLatex.tab.c b/src/gramLatex.tab.c
index 7f731ee..1c792b3 100644
--- a/src/gramLatex.tab.c
+++ b/src/gramLatex.tab.c
@@ -3158,11 +3158,17 @@ static void yyerror(const char *s)
 
   if (!strncmp(s, yyunexpected, sizeof yyunexpected -1)) {
     int i, translated = FALSE;
+
+    /* Make local copy so we can modify it */
+    char s1[PARSE_ERROR_SIZE + 1];
+    strncpy(s1, s, PARSE_ERROR_SIZE);
+    s1[PARSE_ERROR_SIZE] = 0;
+
     /* Edit the error message */
-    expecting = strstr(s + sizeof yyunexpected -1, yyexpecting);
+    expecting = strstr(s1 + sizeof yyunexpected -1, yyexpecting);
     if (expecting) *expecting = '\0';
     for (i = 0; yytname_translations[i]; i += 2) {
-      if (!strcmp(s + sizeof yyunexpected - 1, yytname_translations[i])) {
+      if (!strcmp(s1 + sizeof yyunexpected - 1, yytname_translations[i])) {
         if (yychar < 256 || yychar == END_OF_INPUT)
           snprintf(ParseErrorMsg, PARSE_ERROR_SIZE,
                    _(yyshortunexpected),
@@ -3182,11 +3188,11 @@ static void yyerror(const char *s)
       if (yychar < 256 || yychar == END_OF_INPUT)
         snprintf(ParseErrorMsg, PARSE_ERROR_SIZE,
                  _(yyshortunexpected),
-                 s + sizeof yyunexpected - 1);
+                 s1 + sizeof yyunexpected - 1);
       else
         snprintf(ParseErrorMsg, PARSE_ERROR_SIZE,
                  _(yylongunexpected),
-                 s + sizeof yyunexpected - 1, CHAR(STRING_ELT(yylval, 0)));
+                 s1 + sizeof yyunexpected - 1, CHAR(STRING_ELT(yylval, 0)));
     }
     if (expecting) {
       translated = FALSE;
diff --git a/src/parser/gramLatex.y b/src/parser/gramLatex.y
index 3924ce7..f183679 100644
--- a/src/parser/gramLatex.y
+++ b/src/parser/gramLatex.y
@@ -1069,11 +1069,17 @@ static void yyerror(const char *s)
 
   if (!strncmp(s, yyunexpected, sizeof yyunexpected -1)) {
     int i, translated = FALSE;
+
+    /* Make local copy so we can modify it */
+    char s1[PARSE_ERROR_SIZE + 1];
+    strncpy(s1, s, PARSE_ERROR_SIZE);
+    s1[PARSE_ERROR_SIZE] = 0;
+
     /* Edit the error message */
-    expecting = strstr(s + sizeof yyunexpected -1, yyexpecting);
+    expecting = strstr(s1 + sizeof yyunexpected -1, yyexpecting);
     if (expecting) *expecting = '\0';
     for (i = 0; yytname_translations[i]; i += 2) {
-      if (!strcmp(s + sizeof yyunexpected - 1, yytname_translations[i])) {
+      if (!strcmp(s1 + sizeof yyunexpected - 1, yytname_translations[i])) {
         if (yychar < 256 || yychar == END_OF_INPUT)
           snprintf(ParseErrorMsg, PARSE_ERROR_SIZE,
                    _(yyshortunexpected),
@@ -1093,11 +1099,11 @@ static void yyerror(const char *s)
       if (yychar < 256 || yychar == END_OF_INPUT)
         snprintf(ParseErrorMsg, PARSE_ERROR_SIZE,
                  _(yyshortunexpected),
-                 s + sizeof yyunexpected - 1);
+                 s1 + sizeof yyunexpected - 1);
       else
         snprintf(ParseErrorMsg, PARSE_ERROR_SIZE,
                  _(yylongunexpected),
-                 s + sizeof yyunexpected - 1, CHAR(STRING_ELT(yylval, 0)));
+                 s1 + sizeof yyunexpected - 1, CHAR(STRING_ELT(yylval, 0)));
     }
     if (expecting) {
       translated = FALSE;