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-rw-r--r--src/ctype/_tolower.c2
-rw-r--r--src/ctype/_toupper.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/src/ctype/_tolower.c b/src/ctype/_tolower.c
index 2e656b6e..461e4402 100644
--- a/src/ctype/_tolower.c
+++ b/src/ctype/_tolower.c
@@ -2,7 +2,7 @@
/** convert an uppercase letter to lowercase **/
-#define _tolower(c) tolower(c)
+#define _tolower(__c) tolower(__c)
/***
converts an uppercase letter to its equivalent lowercase letter in the current
diff --git a/src/ctype/_toupper.c b/src/ctype/_toupper.c
index 7c284981..65c6c37a 100644
--- a/src/ctype/_toupper.c
+++ b/src/ctype/_toupper.c
@@ -2,7 +2,7 @@
/** convert a lowercase letter to uppercase **/
-#define _toupper(c) toupper(c)
+#define _toupper(__c) toupper(__c)
/***
converts a lowercase letter to its equivalent uppercase letter in the current