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