diff --git a/ObjectiveGit/Categories/NSData+Git.h b/ObjectiveGit/Categories/NSData+Git.h
index 9054bbb1..d042332f 100644
--- a/ObjectiveGit/Categories/NSData+Git.h
+++ b/ObjectiveGit/Categories/NSData+Git.h
@@ -25,12 +25,10 @@
 /// behavior of the returned buffer is undefined.
 - (git_buf)git_buf;
 
-/// Creates a git_buf from the data and then checks if the buffer contains a NUL
-/// byte.
+/// Returns whether the data contains a NUL byte.
 - (BOOL)git_containsNUL;
 
-/// Creates a git_buf from the data and then checks if the buffer looks like it
-/// contains binary data.
+/// Returns whether the data looks like it contains binary data.
 - (BOOL)git_isBinary;
 
 @end
diff --git a/ObjectiveGit/Categories/NSData+Git.m b/ObjectiveGit/Categories/NSData+Git.m
index 42d31f21..592a4b5e 100644
--- a/ObjectiveGit/Categories/NSData+Git.m
+++ b/ObjectiveGit/Categories/NSData+Git.m
@@ -5,8 +5,8 @@
 #import "NSData+Git.h"
 #import "NSError+Git.h"
 
+#import "git2/blob.h"
 #import "git2/errors.h"
-#import "git2/deprecated.h"
 
 @implementation NSData (Git)
 
@@ -46,13 +46,11 @@ - (git_buf)git_buf {
 }
 
 - (BOOL)git_containsNUL {
-	git_buf buffer = self.git_buf;
-	return git_buf_contains_nul(&buffer) > 0;
+	return memchr(self.bytes, '\0', self.length) != NULL;
 }
 
 - (BOOL)git_isBinary {
-	git_buf buffer = self.git_buf;
-	return git_buf_is_binary(&buffer) > 0;
+	return git_blob_data_is_binary(self.bytes, self.length) > 0;
 }
 
 @end