diff --git a/meta-arm/recipes-security/trusted-services/ts-psa-iat-api-test_git.bb b/meta-arm/recipes-security/trusted-services/ts-psa-iat-api-test_git.bb
index 7deadc00..4db45cc5 100644
--- a/meta-arm/recipes-security/trusted-services/ts-psa-iat-api-test_git.bb
+++ b/meta-arm/recipes-security/trusted-services/ts-psa-iat-api-test_git.bb
@@ -14,8 +14,8 @@ SRC_URI += "git://github.com/laurencelundblade/QCBOR.git;name=psaqcbor;protocol=
            "
 SRCREV_psaqcbor = "42272e466a8472948bf8fca076d113b81b99f0e0"
 
-EXTRA_OECMAKE += "-DPSA_TARGET_QCBOR=${WORKDIR}/git/psaqcbor \
-                 "
+EXTRA_OECMAKE += "-DPSA_TARGET_QCBOR=${UNPACKDIR}/psaqcbor"
+
 # TODO: remove FORTIFY_SOURCE as MbedTLS fails to build in yocto if this
 # compilation flag is used.
 lcl_maybe_fortify = "${@oe.utils.conditional('OPTLEVEL','-O0','','${OPTLEVEL}',d)}"