diff --git a/config/CONFIG.solaris b/config/CONFIG.solaris
index 12ad43147..f3657b372 100644
--- a/config/CONFIG.solaris
+++ b/config/CONFIG.solaris
@@ -131,7 +131,7 @@ UNIX_LDFLAGS = -L$(EPICS_BASE_LIB) $(CCOMPILER_LDFLAGS)
 UNIX_LDLIBS = $(UNIX_SLIBS) -lm $(CCOMPILER_LDLIBS)
  
 # Architecture specific build flags
-ARCH_DEP_CFLAGS = -DSOLARIS -D_REENTRANT
+ARCH_DEP_CFLAGS = -DSOLARIS 
 ARCH_DEP_CXXFLAGS = $(ARCH_DEP_CFLAGS)
 ARCH_DEP_LDLIBS = -lsocket -lnsl
 # -lsocket     needed by libca.a