diff --git a/src/bvector.h b/src/bvector.h
index 4060b77..2573453 100644
--- a/src/bvector.h
+++ b/src/bvector.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _bvector_h_
-#define _bvector_h_
+#ifndef _ccr_bvector_h_
+#define _ccr_bvector_h_
 
 #include <vector>
 #include "types.h"
diff --git a/src/decoding.h b/src/decoding.h
index 9118108..a713157 100644
--- a/src/decoding.h
+++ b/src/decoding.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _decoding_h_
-#define _decoding_h_
+#ifndef _ccr_decoding_h_
+#define _ccr_decoding_h_
 
 #include <vector>
 #include "polynomial.h"
diff --git a/src/fmtseq.h b/src/fmtseq.h
index 027ef14..fca8c8e 100644
--- a/src/fmtseq.h
+++ b/src/fmtseq.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _fmtseq_h_
-#define _fmtseq_h_
+#ifndef _ccr_fmtseq_h_
+#define _ccr_fmtseq_h_
 
 #include <vector>
 #include <list>
diff --git a/src/generator.h b/src/generator.h
index d211a02..cb518da 100644
--- a/src/generator.h
+++ b/src/generator.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _generator_h_
-#define _generator_h_
+#ifndef _ccr_generator_h_
+#define _ccr_generator_h_
 
 #include "arcfour.h"
 #include "prng.h"
diff --git a/src/gf2m.h b/src/gf2m.h
index 9cd5d2f..afa62cb 100644
--- a/src/gf2m.h
+++ b/src/gf2m.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _gf2m_h_
-#define _gf2m_h_
+#ifndef _ccr_gf2m_h_
+#define _ccr_gf2m_h_
 
 #include <vector>
 #include "types.h"
diff --git a/src/ios.h b/src/ios.h
index 457ce3c..7dbf136 100644
--- a/src/ios.h
+++ b/src/ios.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _ios_h_
-#define _ios_h_
+#ifndef _ccr_ios_h_
+#define _ccr_ios_h_
 
 //operator overloads very useful for debugging/hacking
 #include <iostream>
diff --git a/src/matrix.h b/src/matrix.h
index 96f8264..71ca8ec 100644
--- a/src/matrix.h
+++ b/src/matrix.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _matrix_h_
-#define _matrix_h_
+#ifndef _ccr_matrix_h_
+#define _ccr_matrix_h_
 
 #include <vector>
 #include "types.h"
diff --git a/src/mce.h b/src/mce.h
index e285650..eee8ec0 100644
--- a/src/mce.h
+++ b/src/mce.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _mce_h_
-#define _mce_h_
+#ifndef _ccr_mce_h_
+#define _ccr_mce_h_
 
 #include "gf2m.h"
 #include "matrix.h"
diff --git a/src/mce_qd.h b/src/mce_qd.h
index ff25f72..5de5c73 100644
--- a/src/mce_qd.h
+++ b/src/mce_qd.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _mce_qd_h_
-#define _mce_qd_h_
+#ifndef _ccr_mce_qd_h_
+#define _ccr_mce_qd_h_
 
 #include <vector>
 
diff --git a/src/nd.h b/src/nd.h
index a8c8550..15e497d 100644
--- a/src/nd.h
+++ b/src/nd.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _nd_h_
-#define _nd_h_
+#ifndef _ccr_nd_h_
+#define _ccr_nd_h_
 
 #include "gf2m.h"
 #include "matrix.h"
diff --git a/src/permutation.h b/src/permutation.h
index bdcf8f9..b3fc970 100644
--- a/src/permutation.h
+++ b/src/permutation.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _permutation_h_
-#define _permutation_h_
+#ifndef _ccr_permutation_h_
+#define _ccr_permutation_h_
 
 #include <vector>
 #include "types.h"
diff --git a/src/polynomial.h b/src/polynomial.h
index 49979f5..51fcb54 100644
--- a/src/polynomial.h
+++ b/src/polynomial.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _polynomial_h_
-#define _polynomial_h_
+#ifndef _ccr_polynomial_h_
+#define _ccr_polynomial_h_
 
 #include <vector>
 #include "types.h"
diff --git a/src/prng.h b/src/prng.h
index 4a00de1..3d1fb32 100644
--- a/src/prng.h
+++ b/src/prng.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _prng_h_
-#define _prng_h_
+#ifndef _ccr_prng_h_
+#define _ccr_prng_h_
 
 #include "types.h"
 
diff --git a/src/qd_utils.h b/src/qd_utils.h
index e1bd307..fb9baee 100644
--- a/src/qd_utils.h
+++ b/src/qd_utils.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _qdutils_h_
-#define _qdutils_h_
+#ifndef _ccr_qdutils_h_
+#define _ccr_qdutils_h_
 
 #include <vector>
 #include <set>
diff --git a/src/rmd_hash.h b/src/rmd_hash.h
index 27df86a..f6231ee 100644
--- a/src/rmd_hash.h
+++ b/src/rmd_hash.h
@@ -17,8 +17,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _rmd_hash_h_
-#define _rmd_hash_h_
+#ifndef _ccr_rmd_hash_h_
+#define _ccr_rmd_hash_h_
 
 #include "hash.h"
 #include "ripemd128.h"
diff --git a/src/sencode.h b/src/sencode.h
index 10b7aff..914b928 100644
--- a/src/sencode.h
+++ b/src/sencode.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _sencode_h_
-#define _sencode_h_
+#ifndef _ccr_sencode_h_
+#define _ccr_sencode_h_
 
 #include <string>
 #include <vector>
diff --git a/src/sha_hash.h b/src/sha_hash.h
index 0f52e29..e5a51f4 100644
--- a/src/sha_hash.h
+++ b/src/sha_hash.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _sha_hash_h_
-#define _sha_hash_h_
+#ifndef _ccr_sha_hash_h_
+#define _ccr_sha_hash_h_
 
 #include "hash.h"
 #include "sha2.h"
diff --git a/src/types.h b/src/types.h
index 69feb2f..01e0c41 100644
--- a/src/types.h
+++ b/src/types.h
@@ -17,8 +17,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _types_h_
-#define _types_h_
+#ifndef _ccr_types_h_
+#define _ccr_types_h_
 
 /*
  * typedefs. uint should be able to comfortably hold the GF(2^m) elements of
diff --git a/src/vector_item.h b/src/vector_item.h
index 281cb23..385e5ec 100644
--- a/src/vector_item.h
+++ b/src/vector_item.h
@@ -16,8 +16,8 @@
  * along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _vector_item_h_
-#define _vector_item_h_
+#ifndef _ccr_vector_item_h_
+#define _ccr_vector_item_h_
 
 //little STL helper, because writing (*this)[i] everywhere is clumsy
 #define _ccr_declare_vector_item \