diff --git a/utils/ioda_example/gdas_meanioda.h b/utils/ioda_example/gdas_meanioda.h
index c80aacfc0..4184abefb 100644
--- a/utils/ioda_example/gdas_meanioda.h
+++ b/utils/ioda_example/gdas_meanioda.h
@@ -1,5 +1,4 @@
-#ifndef UTILS_IODA_EXAMPLE_GDAS_MEANIODA_H_
-#define UTILS_IODA_EXAMPLE_GDAS_MEANIODA_H_
+#pragma once
 
 #include <iostream>
 #include <numeric>
@@ -94,5 +93,3 @@ namespace gdasapp {
   };
 
 }  // namespace gdasapp
-
-#endif  // UTILS_IODA_EXAMPLE_GDAS_MEANIODA_H_
diff --git a/utils/soca/gdas_incr_handler.h b/utils/soca/gdas_incr_handler.h
index 378ccb979..ee395df92 100644
--- a/utils/soca/gdas_incr_handler.h
+++ b/utils/soca/gdas_incr_handler.h
@@ -1,5 +1,4 @@
-#ifndef UTILS_SOCA_GDAS_INCR_HANDLER_H_
-#define UTILS_SOCA_GDAS_INCR_HANDLER_H_
+#pragma once
 
 #include <netcdf>
 
@@ -75,5 +74,3 @@ namespace gdasapp {
     }
   };
 }  // namespace gdasapp
-
-#endif  // UTILS_SOCA_GDAS_INCR_HANDLER_H_
diff --git a/utils/soca/gdas_postprocincr.h b/utils/soca/gdas_postprocincr.h
index 0a2c7aab2..77e53fb9d 100644
--- a/utils/soca/gdas_postprocincr.h
+++ b/utils/soca/gdas_postprocincr.h
@@ -1,5 +1,4 @@
-#ifndef UTILS_SOCA_GDAS_POSTPROCINCR_H_
-#define UTILS_SOCA_GDAS_POSTPROCINCR_H_
+#pragma once
 
 #include <filesystem>
 
@@ -306,5 +305,3 @@ class PostProcIncr {
   std::string pattern_;
 };
 }  // namespace gdasapp
-
-#endif  // UTILS_SOCA_GDAS_POSTPROCINCR_H_
diff --git a/utils/soca/gdas_socahybridweights.h b/utils/soca/gdas_socahybridweights.h
index 641d8a7ea..c0a3dc927 100644
--- a/utils/soca/gdas_socahybridweights.h
+++ b/utils/soca/gdas_socahybridweights.h
@@ -1,5 +1,4 @@
-#ifndef UTILS_SOCA_GDAS_SOCAHYBRIDWEIGHTS_H_
-#define UTILS_SOCA_GDAS_SOCAHYBRIDWEIGHTS_H_
+#pragma once
 
 #include <netcdf>
 
@@ -88,5 +87,3 @@ namespace gdasapp {
   };
 
 }  // namespace gdasapp
-
-#endif  // UTILS_SOCA_GDAS_SOCAHYBRIDWEIGHTS_H_