diff --git a/format.h b/format.h
index 1f217b5e..52e8d5b3 100644
--- a/format.h
+++ b/format.h
@@ -25,8 +25,6 @@
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#pragma once
-
 #ifndef FMT_FORMAT_H_
 #define FMT_FORMAT_H_
 
diff --git a/posix.h b/posix.h
index 8ae38bec..a2cf2b13 100644
--- a/posix.h
+++ b/posix.h
@@ -25,8 +25,6 @@
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#pragma once
-
 #ifndef FMT_POSIX_H_
 #define FMT_POSIX_H_
 
diff --git a/test/gtest-extra.h b/test/gtest-extra.h
index d34e8188..df9cb7f0 100644
--- a/test/gtest-extra.h
+++ b/test/gtest-extra.h
@@ -25,8 +25,6 @@
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#pragma once
-
 #ifndef FMT_GTEST_EXTRA_H_
 #define FMT_GTEST_EXTRA_H_
 
diff --git a/test/mock-allocator.h b/test/mock-allocator.h
index 8b23aaf6..7de1e1a0 100644
--- a/test/mock-allocator.h
+++ b/test/mock-allocator.h
@@ -25,8 +25,6 @@
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#pragma once
-
 #ifndef FMT_MOCK_ALLOCATOR_H_
 #define FMT_MOCK_ALLOCATOR_H_
 
diff --git a/test/posix-test.h b/test/posix-test.h
index 60242439..4768cb94 100644
--- a/test/posix-test.h
+++ b/test/posix-test.h
@@ -25,8 +25,6 @@
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#pragma once
-
 #ifndef FMT_POSIX_TEST_H
 #define FMT_POSIX_TEST_H