diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7e2eac926..09840e823 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -504,18 +504,6 @@ if(NOT EXISTS ${PG_INCLUDEDIR}/pg_config.h)
   )
 endif()
 
-# This is currently only available in snapshot branches so we cannot use the
-# normal pg version check to determine availability.
-if(EXISTS ${PG_INCLUDEDIR_SERVER}/utils/rel.h)
-  file(READ ${PG_INCLUDEDIR_SERVER}/utils/rel.h PG_UTILS_REL_H)
-  string(REGEX MATCH "RelationGetSmgr" PG_HAVE_RELATION_GET_SMGR
-               ${PG_UTILS_REL_H})
-endif()
-
-if(PG_HAVE_RELATION_GET_SMGR)
-  add_compile_definitions(PG_HAVE_RELATION_GET_SMGR=1)
-endif()
-
 file(READ ${PG_INCLUDEDIR}/pg_config.h PG_CONFIG_H)
 string(REGEX MATCH "#define USE_ASSERT_CHECKING 1" PG_USE_ASSERT_CHECKING
              ${PG_CONFIG_H})
diff --git a/src/compat/compat.h b/src/compat/compat.h
index 290564eae..d49edafd7 100644
--- a/src/compat/compat.h
+++ b/src/compat/compat.h
@@ -759,8 +759,8 @@ pg_strtoint64(const char *str)
 						 is_crosspart_update)
 #endif
 
-#if PG13_GE
-#ifndef PG_HAVE_RELATION_GET_SMGR
+#if (PG12 && PG_VERSION_NUM < 120014) || (PG13 && PG_VERSION_NUM < 130010) ||                      \
+	(PG14 && PG_VERSION_NUM < 140007)
 #include <storage/smgr.h>
 /*
  * RelationGetSmgr
@@ -787,6 +787,5 @@ RelationGetSmgr(Relation rel)
 	return rel->rd_smgr;
 }
 #endif
-#endif
 
 #endif /* TIMESCALEDB_COMPAT_H */