diff --git a/doc/doxygen/riot.doxyfile b/doc/doxygen/riot.doxyfile
index c52a973031..c0b5d5a9ba 100644
--- a/doc/doxygen/riot.doxyfile
+++ b/doc/doxygen/riot.doxyfile
@@ -1981,7 +1981,8 @@ INCLUDE_FILE_PATTERNS  =
 # recursively expanded use the := operator instead of the = operator.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-PREDEFINED             = __attribute__(x)= \
+PREDEFINED             = DOXYGEN \
+                         __attribute__(x)= \
                          ADC_NUMOF \
                          CPUID_ID_LEN \
                          DAC_NUMOF \