diff --git a/src/config.h b/src/config.h
index 320837b7e..b9c68f38b 100644
--- a/src/config.h
+++ b/src/config.h
@@ -253,7 +253,7 @@ int pthread_setname_np(const char *name);
 #endif
 
 /* Check if we can use setcpuaffinity(). */
-#if (defined __linux || defined __NetBSD__ || defined __FreeBSD__)
+#if (defined __linux || defined __NetBSD__ || defined __FreeBSD__ || defined __DragonFly__)
 #define USE_SETCPUAFFINITY
 void setcpuaffinity(const char *cpulist);
 #endif
diff --git a/src/setcpuaffinity.c b/src/setcpuaffinity.c
index 13594113c..77b162103 100644
--- a/src/setcpuaffinity.c
+++ b/src/setcpuaffinity.c
@@ -36,6 +36,10 @@
 #include <sys/param.h>
 #include <sys/cpuset.h>
 #endif
+#ifdef __DragonFly__
+#include <pthread.h>
+#include <pthread_np.h>
+#endif
 #ifdef __NetBSD__
 #include <pthread.h>
 #include <sched.h>
@@ -72,7 +76,7 @@ void setcpuaffinity(const char *cpulist) {
 #ifdef __linux__
     cpu_set_t cpuset;
 #endif
-#ifdef __FreeBSD__
+#if defined (__FreeBSD__) || defined(__DragonFly__)
     cpuset_t cpuset;
 #endif
 #ifdef __NetBSD__
@@ -139,6 +143,9 @@ void setcpuaffinity(const char *cpulist) {
 #ifdef __FreeBSD__
     cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID, -1, sizeof(cpuset), &cpuset);
 #endif
+#ifdef __DragonFly__
+    pthread_setaffinity_np(pthread_self(), sizeof(cpuset), &cpuset);
+#endif
 #ifdef __NetBSD__
     pthread_setaffinity_np(pthread_self(), cpuset_size(cpuset), cpuset);
     cpuset_destroy(cpuset);