diff --git a/Makefile.am b/Makefile.am
index 8c08aa1..1ed0f0a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -18,7 +18,7 @@ if BUILD_WITH_BTREE
 AM_CPPFLAGSBTREE = -DBUILD_WITH_BTREE -std=c++11
 endif
 
-AM_CPPFLAGS = $(AM_CPPFLAGSBTREE) $(AM_CPPFLAGSINVALID)
+AM_CPPFLAGS = $(AM_CPPFLAGSBTREE) $(AM_CPPFLAGSINVALID) -std=c++11
 
 libpipecolors_la_LDFLAGS = -module \
 	-release ${PIPECOLORS_VERSION}
diff --git a/configure.ac b/configure.ac
index 07474a1..cf96ed6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -89,6 +89,8 @@ AM_CONDITIONAL([BUILD_WITH_BTREE], [test "x$enable_btree" = "xyes"])
 
 if test "x$enable_btree" == "xyes"; then
 
+  AC_CHECK_CXX_ARGUMENT([-std=c++11])
+
   AC_CHECK_TOOL([MERCURIAL], [hg], [no])
 
   
diff --git a/examples/example2.cpp b/examples/example2.cpp
index 0149821..13f095a 100644
--- a/examples/example2.cpp
+++ b/examples/example2.cpp
@@ -10,7 +10,7 @@ int main(void) {
    int num = 5;
    const char* str = "My number is";
    const char* str2 = "|10My number is|07";
-   int len = pcprintf("|01%s |41|09%d|39\n", str, num);
+   int len = pcprintf("|01%s |09%d|39\n", str, num);
    pcprintf("|10Length of Len is : |15|30%d\n|07", len);
    int len2 = pcsprintf(buffer, "%s %d\n", str2, num);
    printf("\n%s %d\n", buffer, len2);