diff --git a/build/libblis-symbols.def b/build/libblis-symbols.def
index 152e1a9a0..e15f688aa 100644
--- a/build/libblis-symbols.def
+++ b/build/libblis-symbols.def
@@ -1281,6 +1281,7 @@ bli_l3_prune_unref_mparts_k
 bli_l3_prune_unref_mparts_m
 bli_l3_prune_unref_mparts_n
 bli_l3_thread_decorator
+bli_l3_thread_entry
 bli_l3_thrinfo_create_root
 bli_l3_thrinfo_free
 bli_l3_thrinfo_free_paths
diff --git a/frame/thread/bli_thrcomm.h b/frame/thread/bli_thrcomm.h
index 575703391..fcab115cd 100644
--- a/frame/thread/bli_thrcomm.h
+++ b/frame/thread/bli_thrcomm.h
@@ -42,6 +42,10 @@
 #include "bli_thrcomm_pthreads.h"
 
 
+// thread entry point prototype.
+void* bli_l3_thread_entry( void* data_void );
+
+
 // thrcomm_t query (field only)
 
 static dim_t bli_thrcomm_num_threads( thrcomm_t* comm )
diff --git a/frame/thread/bli_thrcomm_openmp.c b/frame/thread/bli_thrcomm_openmp.c
index 3b1ef94ce..9be8682f8 100644
--- a/frame/thread/bli_thrcomm_openmp.c
+++ b/frame/thread/bli_thrcomm_openmp.c
@@ -202,6 +202,11 @@ void bli_thrcomm_tree_barrier( barrier_t* barack )
 
 #endif
 
+// Define a dummy function bli_l3_thread_entry(), which is needed in the
+// pthreads version, so that when building Windows DLLs (with OpenMP enabled
+// or no multithreading) we don't risk having an unresolved symbol.
+void* bli_l3_thread_entry( void* data_void ) { return NULL; }
+
 //#define PRINT_THRINFO
 
 void bli_l3_thread_decorator
diff --git a/frame/thread/bli_thrcomm_pthreads.c b/frame/thread/bli_thrcomm_pthreads.c
index 88845b5b6..ac6305e30 100644
--- a/frame/thread/bli_thrcomm_pthreads.c
+++ b/frame/thread/bli_thrcomm_pthreads.c
@@ -126,8 +126,6 @@ void bli_thrcomm_barrier( thrcomm_t* comm, dim_t t_id )
 #endif
 
 
-void* bli_l3_thread_entry( void* data_void );
-
 // A data structure to assist in passing operands to additional threads.
 typedef struct thread_data
 {
diff --git a/frame/thread/bli_thrcomm_single.c b/frame/thread/bli_thrcomm_single.c
index b244b3fcc..1d34cfc5a 100644
--- a/frame/thread/bli_thrcomm_single.c
+++ b/frame/thread/bli_thrcomm_single.c
@@ -71,6 +71,11 @@ void bli_thrcomm_barrier( thrcomm_t* comm, dim_t t_id )
 	return;
 }
 
+// Define a dummy function bli_l3_thread_entry(), which is needed in the
+// pthreads version, so that when building Windows DLLs (with OpenMP enabled
+// or no multithreading) we don't risk having an unresolved symbol.
+void* bli_l3_thread_entry( void* data_void ) { return NULL; }
+
 void bli_l3_thread_decorator
      (
        l3int_t     func,