diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6a17868..b75f9c9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -229,5 +229,6 @@ target_compile_options(node PRIVATE
 target_compile_definitions(node PRIVATE
     CHAIN_DATA_DIR="${CMAKE_BINARY_DIR}/chain_data"
     $<$<BOOL:${SKALACOIN_AUTOLYKOS2_REF_AVAILABLE}>:SKALACOIN_AUTOLYKOS2_REF_AVAILABLE>
+    $<$<BOOL:1>:_POSIX_C_SOURCE=200809L>
 )
 set_target_properties(node PROPERTIES OUTPUT_NAME "skalacoin_node")
diff --git a/include/utils.h b/include/utils.h
index 1a37466..086c200 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -36,6 +36,19 @@ static inline uint64_t get_current_time_ms(void) {
     return (spec.tv_sec * 1000) + (spec.tv_nsec / 1000000);
 }
 
+static inline void sleep_for_microseconds(uint64_t microseconds) {
+    struct timespec req;
+    req.tv_sec = (time_t)(microseconds / 1000000ULL);
+    req.tv_nsec = (long)((microseconds % 1000000ULL) * 1000ULL);
+    while (nanosleep(&req, &req) == -1) {
+        continue;
+    }
+}
+
+static inline void sleep_for_milliseconds(uint64_t milliseconds) {
+    sleep_for_microseconds(milliseconds * 1000ULL);
+}
+
 static inline void AddressToHexString(const uint8_t address[32], char out[65]) {
     if (!address || !out) {
         return;
diff --git a/src/autolykos2/autolykos2.c b/src/autolykos2/autolykos2.c
index 830dc3e..179def3 100644
--- a/src/autolykos2/autolykos2.c
+++ b/src/autolykos2/autolykos2.c
@@ -254,7 +254,7 @@ static bool Autolykos2_HashCore(
         DWORD ms = (DWORD)((autolykos2_sleepBetweenHashOperationsMicroseconds + 999) / 1000);
         Sleep(ms);
 #else
-        usleep((useconds_t)autolykos2_sleepBetweenHashOperationsMicroseconds);
+        sleep_for_microseconds(autolykos2_sleepBetweenHashOperationsMicroseconds);
 #endif
     }
 
diff --git a/src/main.c b/src/main.c
index fdc6c9f..1e1b83a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -830,7 +830,7 @@ int main(int argc, char* argv[]) {
                 // Poll for completions or timeouts
                 if (inFlight == 0) {
                     // nothing in flight; small sleep to avoid busy-loop
-                    usleep(100 * 1000);
+                    sleep_for_milliseconds(100);
                     continue;
                 }
 
@@ -945,7 +945,7 @@ int main(int argc, char* argv[]) {
                             // retry with exponential backoff
                             retryCount[i]++;
                             uint64_t backoff = SYNC_BACKOFF_BASE_MS * (1ULL << (retryCount[i] - 1));
-                            usleep((useconds_t)(backoff * 1000ULL));
+                            sleep_for_milliseconds(backoff);
 
                             uint64_t req = requestedHeights[i];
                             if (Node_SendPacket(node, peerConn, PACKET_TYPE_FETCH_BLOCK, &req, sizeof(req)) != 0) {
@@ -964,7 +964,7 @@ int main(int argc, char* argv[]) {
 
                 if (!progressed) {
                     // small sleep to avoid spinning
-                    usleep(50 * 1000);
+                    sleep_for_milliseconds(50);
                 }
             }
 
diff --git a/src/nets/net_node.c b/src/nets/net_node.c
index 5f3dd39..2702d00 100644
--- a/src/nets/net_node.c
+++ b/src/nets/net_node.c
@@ -40,7 +40,7 @@ static void* Node_MaintenanceThread(void* arg) {
                 BalanceSheet_SaveToFile(chainDataDir);
             }
         }
-        usleep((useconds_t)(n->maintenanceIntervalMs * 1000));
+        sleep_for_milliseconds((uint64_t)n->maintenanceIntervalMs);
     }
     return NULL;
 }