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-rw-r--r--Doc/ext/extending.tex2
1 files changed, 1 insertions, 1 deletions
diff --git a/Doc/ext/extending.tex b/Doc/ext/extending.tex
index bc2f9cb..7016f94 100644
--- a/Doc/ext/extending.tex
+++ b/Doc/ext/extending.tex
@@ -1306,7 +1306,7 @@ extern "C" {
/* C API functions */
#define PySpam_System_NUM 0
#define PySpam_System_RETURN int
-#define PySpam_System_PROTO (char *command)
+#define PySpam_System_PROTO (const char *command)
/* Total number of C API pointers */
#define PySpam_API_pointers 1