diff --git a/tests/Makefile b/tests/Makefile
index 9b9c402c73..4ea3767ba6 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -2359,7 +2359,7 @@ export LOG:=$(TEST_OUTPUTDIR)/log
 endif
 LOGFILES=$(TEST_OUTPUTDIR)/log $(TEST_OUTPUTDIR)/longlog $(TEST_OUTPUTDIR)/faillist
 LOGEXT=.testlog .tbslog .tbflog .webtbslog .webtbflog
-TESTUNITDIRS=system dos crt objects strings sysutils math sharemem strutils matrix lineinfo ucomplex fpwidestring cpu fmtbcd windows classes character dateutil fpcunit softfpu variants sortbase sortalgs linux unixutil types
+TESTUNITDIRS=system dos crt objects strings sysutils math sharemem strutils matrix lineinfo ucomplex fpwidestring cpu fmtbcd windows classes character dateutil fpcunit softfpu variants sortbase sortalgs linux unixutil types nullable
 TESTDIRECTDIRS=
 TESTSUBDIRS=cg cg/variants cg/cdecl cpu16 cpu16/i8086 library opt $(addprefix units/,$(TESTUNITDIRS))
 TESTPACKAGESDIRS=win-base webtbs hash fcl-registry fcl-process zlib fcl-db fcl-xml cocoaint bzip2
diff --git a/tests/Makefile.fpc b/tests/Makefile.fpc
index 238d72f5d1..d38a4ec7f5 100644
--- a/tests/Makefile.fpc
+++ b/tests/Makefile.fpc
@@ -159,7 +159,7 @@ LOGFILES=$(TEST_OUTPUTDIR)/log $(TEST_OUTPUTDIR)/longlog $(TEST_OUTPUTDIR)/faill
 LOGEXT=.testlog .tbslog .tbflog .webtbslog .webtbflog
 
 # Subdirs available in the test subdir
-TESTUNITDIRS=system dos crt objects strings sysutils math sharemem strutils matrix lineinfo ucomplex fpwidestring cpu fmtbcd windows classes character dateutil fpcunit softfpu variants sortbase sortalgs linux unixutil types
+TESTUNITDIRS=system dos crt objects strings sysutils math sharemem strutils matrix lineinfo ucomplex fpwidestring cpu fmtbcd windows classes character dateutil fpcunit softfpu variants sortbase sortalgs linux unixutil types nullable
 TESTDIRECTDIRS=
 TESTSUBDIRS=cg cg/variants cg/cdecl cpu16 cpu16/i8086 library opt $(addprefix units/,$(TESTUNITDIRS))
 TESTPACKAGESDIRS=win-base webtbs hash fcl-registry fcl-process zlib fcl-db fcl-xml cocoaint bzip2