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-rw-r--r--cores/arduino/WString.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/cores/arduino/WString.h b/cores/arduino/WString.h
index b3e280a..642b016 100644
--- a/cores/arduino/WString.h
+++ b/cores/arduino/WString.h
@@ -147,7 +147,7 @@ public:
void getBytes(unsigned char *buf, unsigned int bufsize, unsigned int index=0) const;
void toCharArray(char *buf, unsigned int bufsize, unsigned int index=0) const
{getBytes((unsigned char *)buf, bufsize, index);}
- char* c_str() const { return buffer; }
+ const char * c_str() const { return buffer; }
// search
int indexOf( char ch ) const;