diff --git a/cmake/FindPostgres.cmake b/cmake/FindPostgres.cmake
index 29ddf2602ce..78c2f124db4 100644
--- a/cmake/FindPostgres.cmake
+++ b/cmake/FindPostgres.cmake
@@ -23,9 +23,6 @@ if(${PostgreSQL_FOUND})
   set(POSTGRES_INCLUDE_DIR ${PostgreSQL_INCLUDE_DIRS})
   set(POSTGRES_LIBRARY ${PostgreSQL_LIBRARIES})
   set(POSTGRES_FOUND TRUE)
-  if(EXISTS "${POSTGRES_INCLUDE_DIR}/pg_config.h")
-    set(HAVE_PGCONFIG TRUE)
-  endif()
   return()
 endif()
 
@@ -118,11 +115,6 @@ ENDIF(WIN32 AND NOT ANDROID)
 
 IF (POSTGRES_INCLUDE_DIR AND POSTGRES_LIBRARY)
    SET(POSTGRES_FOUND TRUE)
-   IF(EXISTS "${POSTGRES_INCLUDE_DIR}/pg_config.h")
-     SET(HAVE_PGCONFIG TRUE)
-   ELSE(EXISTS "${POSTGRES_INCLUDE_DIR}/pg_config.h")
-     SET(HAVE_PGCONFIG FALSE)
-   ENDIF(EXISTS "${POSTGRES_INCLUDE_DIR}/pg_config.h")
 ENDIF (POSTGRES_INCLUDE_DIR AND POSTGRES_LIBRARY)
 
 
diff --git a/src/app/CMakeLists.txt b/src/app/CMakeLists.txt
index b042c860811..d3a4910a039 100644
--- a/src/app/CMakeLists.txt
+++ b/src/app/CMakeLists.txt
@@ -541,7 +541,7 @@ target_compile_features(qgis_app PRIVATE cxx_std_17)
 
 target_compile_definitions(qgis_app PRIVATE "QT_PLUGINS_DIR=\"${QT_PLUGINS_DIR}\"")
 if (POSTGRES_FOUND)
-  target_compile_definitions(qgis_app PRIVATE -DPOSTGRESQL_VERSION=${PostgreSQL_VERSION_STRING})
+  target_compile_definitions(qgis_app PRIVATE -DPOSTGRESQL_VERSION=\"${PostgreSQL_VERSION_STRING}\")
 endif()
 
 target_include_directories(qgis_app PUBLIC
diff --git a/src/app/qgisapp.cpp b/src/app/qgisapp.cpp
index 038f4516cdc..98e79556b49 100644
--- a/src/app/qgisapp.cpp
+++ b/src/app/qgisapp.cpp
@@ -538,20 +538,10 @@
 
 // Editor widgets
 #include "qgseditorwidgetregistry.h"
+
 //
 // Conditional Includes
 //
-#ifdef HAVE_PGCONFIG
-#undef PACKAGE_BUGREPORT
-#undef PACKAGE_NAME
-#undef PACKAGE_STRING
-#undef PACKAGE_TARNAME
-#undef PACKAGE_VERSION
-#include <pg_config.h>
-#else
-#define PG_VERSION "unknown"
-#endif
-
 #include <sqlite3.h>
 
 #ifdef HAVE_SPATIALITE
@@ -5579,7 +5569,7 @@ QString QgisApp::getVersionString()
   // postgres
   versionString += QStringLiteral( "<td>%1</td><td>" ).arg( tr( "PostgreSQL client version" ) );
 #ifdef HAVE_POSTGRESQL
-  versionString += QStringLiteral( PG_VERSION );
+  versionString += QStringLiteral( POSTGRESQL_VERSION );
 #else
   versionString += tr( "No support" );
 #endif