diff --git a/repos/base/include/spec/arm/cpu/consts.h b/repos/base/include/spec/arm/cpu/consts.h
index 066a9503dc..f0b99dd183 100644
--- a/repos/base/include/spec/arm/cpu/consts.h
+++ b/repos/base/include/spec/arm/cpu/consts.h
@@ -23,7 +23,7 @@ namespace Abi {
 	 * change the stack pointer, we need no further stack adjustment.
 	 */
 	inline Genode::addr_t stack_align(Genode::addr_t addr) {
-		return (addr & ~0xf); }
+		return (addr & ~0xfUL); }
 
 	/**
 	 * Do ABI specific initialization to a freshly created stack
diff --git a/repos/base/include/spec/arm_64/cpu/consts.h b/repos/base/include/spec/arm_64/cpu/consts.h
index 18fe03b14a..f91d34cc71 100644
--- a/repos/base/include/spec/arm_64/cpu/consts.h
+++ b/repos/base/include/spec/arm_64/cpu/consts.h
@@ -22,7 +22,7 @@ namespace Abi {
 	 * On ARM we align the stack top to 16-byte.
 	 */
 	inline Genode::addr_t stack_align(Genode::addr_t addr) {
-		return (addr & ~0xf); }
+		return (addr & ~0xfUL); }
 
 	/**
 	 * Do ABI specific initialization to a freshly created stack
diff --git a/repos/base/src/include/base/internal/ipc_server.h b/repos/base/src/include/base/internal/ipc_server.h
index 08a74c2df5..91b4ed803f 100644
--- a/repos/base/src/include/base/internal/ipc_server.h
+++ b/repos/base/src/include/base/internal/ipc_server.h
@@ -33,7 +33,7 @@ namespace Genode {
 	struct Rpc_request
 	{
 		Reply_capability caller { };
-		unsigned long    badge = ~0;
+		unsigned long    badge = ~0UL;
 
 		Rpc_request() { }
 
diff --git a/repos/base/src/include/base/internal/output.h b/repos/base/src/include/base/internal/output.h
index 97770cc920..ada980e5c7 100644
--- a/repos/base/src/include/base/internal/output.h
+++ b/repos/base/src/include/base/internal/output.h
@@ -146,7 +146,7 @@ static inline void out_float(T value, unsigned base, unsigned length, OUT_CHAR_F
 			volatile_value = (T)(volatile_value - (T)integer);
 			volatile_value = (T)(volatile_value * (T)base);
 
-			integer = (int64_t)volatile_value;
+			integer = (uint64_t)volatile_value;
 			out_char(ascii((int)integer));
 
 			length--;
diff --git a/repos/base/src/lib/base/allocator_avl.cc b/repos/base/src/lib/base/allocator_avl.cc
index e1d31d1d1f..6a51036ebe 100644
--- a/repos/base/src/lib/base/allocator_avl.cc
+++ b/repos/base/src/lib/base/allocator_avl.cc
@@ -99,7 +99,7 @@ Allocator_avl_base::Alloc_md_result Allocator_avl_base::_alloc_block_metadata()
 {
 	return _md_alloc.try_alloc(sizeof(Block)).convert<Alloc_md_result>(
 		[&] (void *ptr) {
-			return construct_at<Block>(ptr, 0, 0, 0); },
+			return construct_at<Block>(ptr, 0U, 0U, 0); },
 		[&] (Alloc_error error) {
 			return error; });
 }
diff --git a/repos/base/src/lib/base/heap.cc b/repos/base/src/lib/base/heap.cc
index f7b77a6906..7c04c3ae29 100644
--- a/repos/base/src/lib/base/heap.cc
+++ b/repos/base/src/lib/base/heap.cc
@@ -130,7 +130,7 @@ Heap::_allocate_dataspace(size_t size, bool enforce_separate_metadata)
 				/* add new local address range to our local allocator */
 				_alloc->add_range((addr_t)attach_guard.ptr, size).with_result(
 					[&] (Range_allocator::Range_ok) {
-						metadata = _alloc->alloc_aligned(sizeof(Heap::Dataspace), log2(16)); },
+						metadata = _alloc->alloc_aligned(sizeof(Heap::Dataspace), log2(16U)); },
 					[&] (Alloc_error error) {
 						metadata = error; });
 			}
@@ -153,7 +153,7 @@ Heap::_allocate_dataspace(size_t size, bool enforce_separate_metadata)
 
 Allocator::Alloc_result Heap::_try_local_alloc(size_t size)
 {
-	return _alloc->alloc_aligned(size, log2(16)).convert<Alloc_result>(
+	return _alloc->alloc_aligned(size, log2(16U)).convert<Alloc_result>(
 
 		[&] (void *ptr) {
 			_quota_used += size;
diff --git a/repos/os/src/lib/sandbox/utils.h b/repos/os/src/lib/sandbox/utils.h
index 7db3b3a2c9..90bb177a4d 100644
--- a/repos/os/src/lib/sandbox/utils.h
+++ b/repos/os/src/lib/sandbox/utils.h
@@ -167,7 +167,7 @@ namespace Sandbox {
 	 */
 	inline Prio_levels prio_levels_from_xml(Xml_node const &config)
 	{
-		long const prio_levels = config.attribute_value("prio_levels", 0UL);
+		long const prio_levels = config.attribute_value("prio_levels", 0L);
 
 		if (prio_levels && ((prio_levels >= (long)sizeof(prio_levels)*8) ||
 		                    (prio_levels != (1L << log2(prio_levels))))) {