diff --git a/unit-tests/export.mk b/unit-tests/export.mk

index bab08ee..7c2e5e6 100644

--- a/unit-tests/export.mk

+++ b/unit-tests/export.mk

@@ -40,7 +40,7 @@ BAR=	bar is ${UT_FU}

 .MAKE.EXPORTED+=	UT_ZOO UT_TEST

-FILTER_CMD?=	egrep -v '^(MAKEFLAGS|MALLOC_.*|PATH|PWD|SHLVL|_|&)='

+FILTER_CMD?=	grep -E -v '^(MAKEFLAGS|MALLOC_.*|PATH|PWD|SHLVL|_|&)='

 all:

 	@env | ${FILTER_CMD} | sort

diff --git a/unit-tests/make-exported.mk b/unit-tests/make-exported.mk

index 58cb151..dad893f 100755

--- a/unit-tests/make-exported.mk

+++ b/unit-tests/make-exported.mk

@@ -22,4 +22,4 @@ UT_VAR=		${UNEXPANDED}

 .MAKE.EXPORTED=		-literal UT_VAR

 all:

-	@env | sort | egrep '^UT_|make-exported-value' || true

+	@env | sort | grep -E '^UT_|make-exported-value' || true