diff --git a/include/crucible/error.h b/include/crucible/error.h
index 0b57869..170b5ba 100644
--- a/include/crucible/error.h
+++ b/include/crucible/error.h
@@ -100,12 +100,6 @@ namespace crucible {
 } while (0)
 
 // macros for checking a constraint
-#define CHECK_CONSTRAINT(value, expr) do { \
-	if (!(expr)) { \
-		THROW_ERROR(out_of_range, #value << " = " << value << " failed constraint check (" << #expr << ")"); \
-	} \
-} while(0)
-
 #define THROW_CHECK0(type, expr) do { \
 	if (!(expr)) { \
 		THROW_ERROR(type, "failed constraint check (" << #expr << ")"); \
diff --git a/lib/fs.cc b/lib/fs.cc
index 366934f..5e49544 100644
--- a/lib/fs.cc
+++ b/lib/fs.cc
@@ -625,7 +625,7 @@ namespace crucible {
 	void
 	Fiemap::do_ioctl(int fd)
 	{
-		CHECK_CONSTRAINT(m_min_count, m_min_count <= m_max_count);
+		THROW_CHECK1(out_of_range, m_min_count, m_min_count <= m_max_count);
 
 		auto extent_count = m_min_count;
 		vector<char> ioctl_arg = vector_copy_struct<fiemap>(this);