diff --git a/tests/core/msg_queue_print/tests/01-run.py b/tests/core/msg_queue_print/tests/01-run.py
index a03118d268..21ae8441a1 100755
--- a/tests/core/msg_queue_print/tests/01-run.py
+++ b/tests/core/msg_queue_print/tests/01-run.py
@@ -46,7 +46,7 @@ def expect_content(child, counter):
         else:
             child.expect(r'type: 0x0000, content: 0 \((0x)?0+\)')
     else:
-        child.expect_exact(f'type: 0x{counter:04x}, content: {counter} (0x{counter:x})')
+        child.expect(f'type: 0x{counter:04x}, content: {counter} \((0x)?0*{counter:x}\)')
 
 
 def testfunc(child):
diff --git a/tests/net/gnrc_ipv6_fwd_w_sub/tests/01-run.py b/tests/net/gnrc_ipv6_fwd_w_sub/tests/01-run.py
index be26456e31..a30698236b 100755
--- a/tests/net/gnrc_ipv6_fwd_w_sub/tests/01-run.py
+++ b/tests/net/gnrc_ipv6_fwd_w_sub/tests/01-run.py
@@ -31,10 +31,11 @@ def testfunc(child):
     child.expect(r"00000020  55  44  33  FF  FE  22  11  00  54  B8  59  AF  3A  B4  5C  85")
     child.expect(r"00000030  1E  CE  E2  EB  05  4E  A3  85")
     child.sendline("pktbuf")
-    child.expect(r"packet buffer: first byte: (0x[0-9a-fA-F]+), "
-                 r"last byte: 0x[0-9a-fA-F]+ \(size: (\d+)\)")
+    child.expect(r"packet buffer: first byte: ((0x)?[0-9a-fA-F]+), "
+                 r"last byte: (0x)?[0-9a-fA-F]+ \(size: (\d+)\)")
     start_addr = child.match.group(1)
-    size = child.match.group(2)
+    size = child.match.group(4)
+    print(start_addr, size)
     child.expect(r"  position of last byte used: \d+")
     child.expect(r"~ unused: {} \(next: (\(nil\)|0(x0+)?), size: +{}\) ~"
                  .format(start_addr, size))
diff --git a/tests/riotboot/tests/01-run.py b/tests/riotboot/tests/01-run.py
index a4bba6be03..f2c820b120 100755
--- a/tests/riotboot/tests/01-run.py
+++ b/tests/riotboot/tests/01-run.py
@@ -66,9 +66,9 @@ class RiotbootDevice:
         # Ask for data of all slots
         child.expect_exact('>')
         child.sendline("dumpaddrs")
-        child.expect(r"slot 0: metadata: 0x[0-9a-fA-F]{1,8} "
+        child.expect(r"slot 0: metadata: (0x)?[0-9a-fA-F]{1,8} "
                      r"image: 0x[0-9a-fA-F]{8}\r\n")
-        child.expect(r"slot 1: metadata: 0x[0-9a-fA-F]{1,8} "
+        child.expect(r"slot 1: metadata: (0x)?[0-9a-fA-F]{1,8} "
                      r"image: 0x[0-9a-fA-F]{8}\r\n")
         child.expect_exact('>')
 
diff --git a/tests/sys/heap_cmd/tests/01-run.py b/tests/sys/heap_cmd/tests/01-run.py
index 92010ccd40..6f058b0c5e 100755
--- a/tests/sys/heap_cmd/tests/01-run.py
+++ b/tests/sys/heap_cmd/tests/01-run.py
@@ -17,14 +17,14 @@ def testfunc(child):
     if ret == 1:
         return
     child.sendline('malloc 100')
-    child.expect('allocated 0x')
+    child.expect('allocated (0x)?')
     addr = child.readline()
     addr = addr[:-2]
     child.expect_exact('> ')
     child.sendline('heap')
     child.expect(r'heap: \d+ \(used \d+, free \d+\) \[bytes\]')
     child.sendline('free 0x' + addr)
-    child.expect('freeing 0x' + addr)
+    child.expect('freeing (0x)?' + addr)
     child.expect_exact('>')
     child.sendline('heap')
     child.expect(r'heap: \d+ \(used \d+, free \d+\) \[bytes\]')
diff --git a/tests/sys/malloc/tests/01-run.py b/tests/sys/malloc/tests/01-run.py
index 622d59a028..ae81657f77 100755
--- a/tests/sys/malloc/tests/01-run.py
+++ b/tests/sys/malloc/tests/01-run.py
@@ -22,7 +22,7 @@ def testfunc(child):
     number_of_tests = int(child.match.group(1))
     initial_allocations = 0
     for _ in range(number_of_tests):
-        child.expect(r"Allocated {} Bytes at 0x[a-z0-9]+, total [a-z0-9]+\r\n"
+        child.expect(r"Allocated {} Bytes at (0x)?[a-z0-9]+, total [a-z0-9]+\r\n"
                      .format(chunk_size))
         child.expect(r'Allocations count: (\d+)\r\n',
                      timeout=ALLOCATION_TIMEOUT)
@@ -31,7 +31,7 @@ def testfunc(child):
         if initial_allocations == 0:
             initial_allocations = allocations
         assert initial_allocations == allocations
-        child.expect(r"Free {} Bytes at 0x[a-z0-9]+, total [a-z0-9]+\r\n"
+        child.expect(r"Free {} Bytes at (0x)?[a-z0-9]+, total [a-z0-9]+\r\n"
                      .format(chunk_size))
         child.expect(r'Free count: (\d+)\r\n', timeout=FREE_TIMEOUT)
         freed = int(child.match.group(1))
diff --git a/tests/sys/memarray/tests/01-run.py b/tests/sys/memarray/tests/01-run.py
index 68de6a6848..cb7f51f9eb 100755
--- a/tests/sys/memarray/tests/01-run.py
+++ b/tests/sys/memarray/tests/01-run.py
@@ -22,10 +22,10 @@ def testfunc(child):
         for test in range(number_of_tests):
             child.expect_exact("TEST #{}:".format(test + 1))
             for i in range(max_number_blocks):
-                child.expect(r'\({}, @@@@@@@\) Allocated \d+ Bytes at 0x[a-z0-9]+,'
+                child.expect(r'\({}, @@@@@@@\) Allocated \d+ Bytes at (0x)?[a-zA-Z0-9]+,'
                              r' total [0-9]+\r\n'.format(i))
             for i in range(max_number_blocks):
-                child.expect(r'Free \({}\) \d+ Bytes at 0x[a-z0-9]+,'
+                child.expect(r'Free \({}\) \d+ Bytes at (0x)?[a-zA-Z0-9]+,'
                              ' total [0-9]+\r\n'.format(i))
 
     child.expect_exact("Extend and reduce tests")