diff --git a/ctags/main/lcpp.c b/ctags/main/lcpp.c
index 16462d2c..e3141c1b 100644
--- a/ctags/main/lcpp.c
+++ b/ctags/main/lcpp.c
@@ -210,7 +210,7 @@ static void readIdentifier (int c, vString *const name)
 	{
 		vStringPut (name, c);
 		c = getcFromInputFile ();
-	} while (c != EOF && isident (c));
+	} while (c != EOF && cppIsident (c));
 	ungetcToInputFile (c);
 	vStringTerminate (name);
 }
@@ -810,9 +810,9 @@ process:
 					int prev2 = getNthPrevCFromInputFile (2, '\0');
 					int prev3 = getNthPrevCFromInputFile (3, '\0');
 
-					if (! isident (prev) ||
-					    (! isident (prev2) && (prev == 'L' || prev == 'u' || prev == 'U')) ||
-					    (! isident (prev3) && (prev2 == 'u' && prev == '8')))
+					if (! cppIsident (prev) ||
+					    (! cppIsident (prev2) && (prev == 'L' || prev == 'u' || prev == 'U')) ||
+					    (! cppIsident (prev3) && (prev2 == 'u' && prev == '8')))
 					{
 						int next = getcFromInputFile ();
 						if (next != DOUBLE_QUOTE)
diff --git a/ctags/main/lcpp.h b/ctags/main/lcpp.h
index 03b082ec..4f8af6a0 100644
--- a/ctags/main/lcpp.h
+++ b/ctags/main/lcpp.h
@@ -22,7 +22,7 @@
 /*  Is the character valid as a character of a C identifier?
  *  VMS allows '$' in identifiers.
  */
-#define isident(c)  (isalnum(c) || (c) == '_' || (c) == '$')
+#define cppIsident(c)  (isalnum(c) || (c) == '_' || (c) == '$')
 
 /*  Is the character valid as the first character of a C identifier?
  *  C++ allows '~' in destructors.
diff --git a/ctags/parsers/c.c b/ctags/parsers/c.c
index 939c1cce..42ce5bf2 100644
--- a/ctags/parsers/c.c
+++ b/ctags/parsers/c.c
@@ -1786,7 +1786,7 @@ static void readIdentifier (tokenInfo *const token, const int firstChar)
 	{
 		vStringPut (name, c);
 		c = cppGetc ();
-	} while (isident (c) || (isInputLanguage (Lang_vala) && '.' == c));
+	} while (cppIsident (c) || (isInputLanguage (Lang_vala) && '.' == c));
 	vStringTerminate (name);
 	cppUngetc (c);        /* unget non-identifier character */
 
@@ -1810,7 +1810,7 @@ static void readPackageName (tokenInfo *const token, const int firstChar)
 
 	initToken (token);
 
-	while (isident (c)  ||  c == '.')
+	while (cppIsident (c)  ||  c == '.')
 	{
 		vStringPut (name, c);
 		c = cppGetc ();