diff --git a/community/ptex/APKBUILD b/community/ptex/APKBUILD
index 7d20d2cdb81..715d2c9563a 100644
--- a/community/ptex/APKBUILD
+++ b/community/ptex/APKBUILD
@@ -5,12 +5,14 @@ pkgver=2.4.3
 pkgrel=0
 pkgdesc="texture mapping system by Walt Disney Animation Studios"
 url="https://ptex.us/"
-arch="all !s390x" # ptex doesn't like big endian
+# s390x: no big-endian support
+arch="all !s390x"
 license="BSD-3-Clause"
 makedepends="cmake doxygen graphviz samurai zlib-dev"
 subpackages="$pkgname-static $pkgname-dev $pkgname-doc $pkgname-tools:tools"
 source="$pkgname-$pkgver.tar.gz::https://github.com/wdas/ptex/archive/v$pkgver.tar.gz
 	0001-fix-soversion.patch
+	parallel-tests.patch
 	"
 
 build() {
@@ -25,7 +27,7 @@ build() {
 
 check() {
 	cd build
-	CTEST_OUTPUT_ON_FAILURE=TRUE ctest -j1
+	CTEST_OUTPUT_ON_FAILURE=TRUE ctest
 }
 
 package() {
@@ -41,4 +43,5 @@ tools() {
 sha512sums="
 34fcaf1c4fe27cb4e66d66bb729137ef17ffeea2bc2d849f2f5f543b19acc250f425633142320ce797c2a086e04bc3e0870c94928ad45d94e34faee71af36890  ptex-2.4.3.tar.gz
 5c82637192986e3dace72e70f8aa539aacc29da5c4c29359616140070b77af2eaa906bad93a793e60baecdb1bd135ca76984451240c071ce2f9133ecc0495a03  0001-fix-soversion.patch
+25a3e964cfe85a564a713331594456457cab731c3ed5b305621d30ac79c7f4fb005c309118aeaacc37ad521522c37472db60505384b0187c818786007eafb7ff  parallel-tests.patch
 "
diff --git a/community/ptex/parallel-tests.patch b/community/ptex/parallel-tests.patch
new file mode 100644
index 00000000000..dd3380e1ca1
--- /dev/null
+++ b/community/ptex/parallel-tests.patch
@@ -0,0 +1,11 @@
+diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
+index 36950a7..c6ecb05 100644
+--- a/src/tests/CMakeLists.txt
++++ b/src/tests/CMakeLists.txt
+@@ -27,3 +27,6 @@ add_test(NAME wtest COMMAND wtest)
+ add_compare_test(rtest)
+ add_compare_test(ftest)
+ add_test(NAME halftest COMMAND halftest)
++
++set_tests_properties(rtest PROPERTIES DEPENDS wtest)
++set_tests_properties(ftest PROPERTIES DEPENDS wtest)