diff --git a/owlps-positioning/Doxyfile b/owlps-positioning/Doxyfile
index 107a93d..1ccfe40 100644
--- a/owlps-positioning/Doxyfile
+++ b/owlps-positioning/Doxyfile
@@ -31,7 +31,7 @@ PROJECT_NAME           = "OWLPS Positioning"
 # This could be handy for archiving the generated documentation or
 # if some version control system is used.
 
-PROJECT_NUMBER         = 0.9.1
+PROJECT_NUMBER         = $(OWLPS_VERSION)
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
 # base path where the generated documentation will be put.
diff --git a/owlps-positioning/Makefile b/owlps-positioning/Makefile
index 669bca9..ba8433b 100644
--- a/owlps-positioning/Makefile
+++ b/owlps-positioning/Makefile
@@ -24,7 +24,7 @@ MKDIR = mkdir -pv
 # Other tools
 STYLE = astyle --style=gnu --formatted
 CPPCHECK = cppcheck --quiet --enable=all
-DOXYGEN = doxygen >/dev/null
+DOXYGEN = OWLPS_VERSION=$(OWLPS_VERSION) doxygen >/dev/null
 
 # Compilation tools
 COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)