diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index cddc7050..ba9fbce3 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -27,6 +27,17 @@
 #
 # LLNL-CODE-402774
 
+include(PnMPI_headers)
+
+
+# Include common include directories.
+#
+# As almost all source code files need any kind of PnMPI header to be included,
+# the common PnMPI header path will be included for all subdirectories instead
+# of including the path independently in all paths.
+include_directories(${PNMPI_HEADER_DIR})
+
+
 add_subdirectory(modules)
 add_subdirectory(patch)
 add_subdirectory(pnmpi)
diff --git a/src/modules/CMakeLists.txt b/src/modules/CMakeLists.txt
index 32adb9ac..1e6d4139 100644
--- a/src/modules/CMakeLists.txt
+++ b/src/modules/CMakeLists.txt
@@ -35,7 +35,6 @@ if (NOT ENABLE_MODULES)
 endif ()
 
 
-include(PnMPI_headers)
 include(PnMPI_modules)
 include(GNUInstallDirs)
 
@@ -74,7 +73,6 @@ set(PnMPI_MODULES_DIR "${CMAKE_INSTALL_FULL_LIBDIR}/pnmpi-modules"
 # Include directories for all modules.
 include_directories(
   ${MPI_C_INCLUDE_PATH}
-  ${PNMPI_HEADER_DIR}
 )
 
 
diff --git a/src/modules/metrics/CMakeLists.txt b/src/modules/metrics/CMakeLists.txt
index 89953046..6089a292 100644
--- a/src/modules/metrics/CMakeLists.txt
+++ b/src/modules/metrics/CMakeLists.txt
@@ -49,7 +49,7 @@ configure_file(config.h.in config.h)
 
 
 include_directories(
-  ${CMAKE_CURRENT_SOURCE_DIR}
+  ${CMAKE_CURRENT_SOURCE_DIR} # Required for generated source files.
   ${CMAKE_CURRENT_BINARY_DIR}
 )
 
diff --git a/src/pnmpi/CMakeLists.txt b/src/pnmpi/CMakeLists.txt
index e7e68756..874a7869 100644
--- a/src/pnmpi/CMakeLists.txt
+++ b/src/pnmpi/CMakeLists.txt
@@ -30,7 +30,6 @@
 include(CheckFortranMPIFunctionExists)
 include(CheckMPIFunctionExists)
 include(easylib)
-include(PnMPI_headers)
 
 
 # Feature checks.
@@ -54,6 +53,17 @@ if (C11_FOUND)
 endif ()
 
 
+# Include common include directories.
+#
+# Instead of including the same directories in the recursive directories, the
+# common ones will be included before recursing for sharing.
+include_directories(
+  ${PROJECT_BINARY_DIR}
+  ${CMAKE_CURRENT_BINARY_DIR}
+  ${CMAKE_CURRENT_SOURCE_DIR}
+  ${MPI_C_INCLUDE_PATH}
+)
+
 # Recurse into subdirectories.
 #
 # This has to be done BEFORE adding the PnMPI libraries, because for adding
@@ -220,11 +230,3 @@ install(
   EXPORT pnmpi-libs
   DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/cmake/PnMPI
 )
-
-# Extra directories to include from when building.
-include_directories(
-  ${PROJECT_BINARY_DIR}
-  ${CMAKE_CURRENT_BINARY_DIR}
-  ${CMAKE_CURRENT_SOURCE_DIR}
-  ${PNMPI_HEADER_DIR}
-  ${MPI_C_INCLUDE_PATH})
diff --git a/src/pnmpi/debug/CMakeLists.txt b/src/pnmpi/debug/CMakeLists.txt
index 5c6f611f..be0ac087 100644
--- a/src/pnmpi/debug/CMakeLists.txt
+++ b/src/pnmpi/debug/CMakeLists.txt
@@ -55,11 +55,6 @@ pnmpi_add_man(pnmpi_debug_io PNMPI_Warning)
 pnmpi_add_man(pnmpi_debug_io PNMPI_Error)
 
 
-include_directories(
-  ${PNMPI_HEADER_DIR}
-  ${MPI_C_INCLUDE_PATH})
-
-
 easy_add_library(pnmpi_debug OBJECT
   get_rank.c
   print_debug.c
diff --git a/src/pnmpi/modules/CMakeLists.txt b/src/pnmpi/modules/CMakeLists.txt
index 736dc0d0..fe4fedc9 100644
--- a/src/pnmpi/modules/CMakeLists.txt
+++ b/src/pnmpi/modules/CMakeLists.txt
@@ -47,13 +47,6 @@ pnmpi_add_man(pnmpi_module_hooks PNMPI_AppStartup)
 pnmpi_add_man(pnmpi_module_hooks PNMPI_AppShutdown)
 
 
-include_directories(
-  ${PNMPI_HEADER_DIR}
-  ${CMAKE_CURRENT_SOURCE_DIR}/..
-  ${CMAKE_CURRENT_BINARY_DIR}/..
-  ${PROJECT_BINARY_DIR}
-  ${MPI_C_INCLUDE_PATH})
-
 easy_add_library(pnmpi_modules OBJECT
   call_hook.c
   hook_activated.c
diff --git a/src/pnmpi/service/CMakeLists.txt b/src/pnmpi/service/CMakeLists.txt
index 197ef8cb..189bb869 100644
--- a/src/pnmpi/service/CMakeLists.txt
+++ b/src/pnmpi/service/CMakeLists.txt
@@ -62,14 +62,6 @@ pnmpi_add_man(PNMPI_Service_strerror "")
 pnmpi_add_man(PNMPI_status_t "")
 
 
-include_directories(
-  ${PNMPI_HEADER_DIR}
-  ${CMAKE_CURRENT_SOURCE_DIR}/..
-  ${CMAKE_CURRENT_BINARY_DIR}/..
-  ${PROJECT_BINARY_DIR}
-  ${MPI_C_INCLUDE_PATH})
-
-
 easy_add_library(pnmpi_service OBJECT
   callHook.c
   changeStack.c
diff --git a/src/pnmpi/wrapper/CMakeLists.txt b/src/pnmpi/wrapper/CMakeLists.txt
index e24b2866..15f07e72 100644
--- a/src/pnmpi/wrapper/CMakeLists.txt
+++ b/src/pnmpi/wrapper/CMakeLists.txt
@@ -50,9 +50,6 @@ pnmpi_add_private_header(mpi_interface.h)
 pnmpi_add_private_header(mpi_reentry.h)
 pnmpi_add_private_header(return_address.h.in return_address.h)
 
-
-include_directories(${PNMPI_HEADER_DIR})
-
 easy_add_library(pnmpi_wrapper OBJECT
   mpi_interface.c
   mpi_reentry.c
diff --git a/src/pnmpize/CMakeLists.txt b/src/pnmpize/CMakeLists.txt
index 06cc07ef..0613cfa2 100644
--- a/src/pnmpize/CMakeLists.txt
+++ b/src/pnmpize/CMakeLists.txt
@@ -37,7 +37,6 @@ endif ()
 
 
 include(GNUInstallDirs)
-include(PnMPI_headers)
 
 find_package(argp REQUIRED)
 find_package(help2man)
@@ -71,9 +70,7 @@ configure_file(config.h.in config.h)
 
 
 # Include all required directories.
-include_directories(
-  ${PNMPI_HEADER_DIR}
-  ${CMAKE_CURRENT_BINARY_DIR})
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
 
 # Build and install PnMPIze.