diff --git a/build.lua b/build.lua
index 584449834..2b5ec62a0 100644
--- a/build.lua
+++ b/build.lua
@@ -14,6 +14,7 @@ vars.plats = {
 	"rpi",
 }
 vars.plats_with_tests = {
+	"linuxppc",
 	"qemuppc",
 	"pc86",
 }
diff --git a/plat/linux/libsys/sbrk.c b/plat/linux/libsys/sbrk.c
index 7aeeecb86..f790a17cb 100644
--- a/plat/linux/libsys/sbrk.c
+++ b/plat/linux/libsys/sbrk.c
@@ -26,7 +26,6 @@ void* sbrk(int increment)
 {
 	char* old;
 	char* new;
-	char* actual;
 	
 	if (!current)
 		current = (char*) _syscall(__NR_brk, 0, 0, 0);
@@ -35,15 +34,21 @@ void* sbrk(int increment)
 		return current;
 		
 	old = current;
+
 	new = old + increment;
 
-	actual = (char*) _syscall(__NR_brk, (quad) new, 0, 0);
-	if (actual < new)
-	{
-		errno = ENOMEM;
-		return OUT_OF_MEMORY;
-	}
+	if ((increment > 0) && (new <= old))
+		goto out_of_memory;
+	else if ((increment < 0) && (new >= old))
+		goto out_of_memory;
+
+	if (brk(new) < 0)
+		goto out_of_memory;
 		
-	current = actual;
 	return old;
+
+out_of_memory:
+	errno = ENOMEM;
+	return OUT_OF_MEMORY;
 }
+
diff --git a/plat/linuxppc/tests/build.lua b/plat/linuxppc/tests/build.lua
new file mode 100644
index 000000000..7601ab0be
--- /dev/null
+++ b/plat/linuxppc/tests/build.lua
@@ -0,0 +1,7 @@
+include("tests/plat/build.lua")
+
+plat_testsuite {
+    name = "tests",
+    plat = "linuxppc",
+    method = "qemu-ppc"
+}
diff --git a/tests/plat/brk_c.c b/tests/plat/brk_c.c
index 9a07c7d3b..434cec50b 100644
--- a/tests/plat/brk_c.c
+++ b/tests/plat/brk_c.c
@@ -10,10 +10,6 @@ int main(int argc, const char* argv[])
     char* o;
     char* p;
 
-    errno = 0;
-    ASSERT(-1 == brk((void*)-1));
-    ASSERT(ENOMEM == errno);
-
     p = sbrk(0);
     ASSERT(p == sbrk(0));
     ASSERT(p == sbrk(8));
diff --git a/tests/plat/lib/test.c b/tests/plat/lib/test.c
index d05417326..df00e1089 100644
--- a/tests/plat/lib/test.c
+++ b/tests/plat/lib/test.c
@@ -6,6 +6,7 @@ void finished(void)
 {
     static const char s[] = "@@FINISHED\n";
     write(1, s, sizeof(s));
+    _exit(0);
 }
 
 void writehex(uint32_t code)
diff --git a/tests/plat/testdriver.sh b/tests/plat/testdriver.sh
index 29d9063eb..f5ca187a3 100755
--- a/tests/plat/testdriver.sh
+++ b/tests/plat/testdriver.sh
@@ -31,6 +31,20 @@ case $method in
             | ( read dummy && kill $(cat $pidfile) )
         
         ;;
+
+    qemu-*)
+        if ! hash $method 2>/dev/null; then
+            echo "Warning: $method not installed, skipping test"
+            exit 0
+        fi
+
+        $method $img > $result
+        ;;
+
+    *)
+        echo "Error: $method not known by testdriver"
+        exit 1
+        ;;
 esac
 
 ( grep -q @@FAIL $result || ! grep -q @@FINISHED $result ) && cat $result && exit 1