diff --git a/configure/os/CONFIG.Common.linux-386 b/configure/os/CONFIG.Common.linux-386
index 5d01a0fbf..3fa40381a 100644
--- a/configure/os/CONFIG.Common.linux-386
+++ b/configure/os/CONFIG.Common.linux-386
@@ -10,7 +10,7 @@
 # Include definitions common to all linux x86 targets
 include $(CONFIG)/os/CONFIG.Common.linux-x86
 
-ARCH_DEP_CFLAGS += -march=i386
+ARCH_DEP_CFLAGS = -march=i386
 
 ifeq ($(BUILD_CLASS),CROSS)
   VALID_BUILDS = Ioc
diff --git a/configure/os/CONFIG.Common.linux-486 b/configure/os/CONFIG.Common.linux-486
index 6a39e52db..a5af47992 100644
--- a/configure/os/CONFIG.Common.linux-486
+++ b/configure/os/CONFIG.Common.linux-486
@@ -10,7 +10,7 @@
 # Include definitions common to all linux x86 targets
 include $(CONFIG)/os/CONFIG.Common.linux-x86
 
-ARCH_DEP_CFLAGS += -march=i486
+ARCH_DEP_CFLAGS = -march=i486
 
 ifeq ($(BUILD_CLASS),CROSS)
    VALID_BUILDS = Ioc
diff --git a/configure/os/CONFIG.Common.linux-586 b/configure/os/CONFIG.Common.linux-586
index f6cc20612..048d3aa8e 100644
--- a/configure/os/CONFIG.Common.linux-586
+++ b/configure/os/CONFIG.Common.linux-586
@@ -11,7 +11,7 @@
 include $(CONFIG)/os/CONFIG.Common.linux-x86
 
 # i586 is equivalent to pentium
-ARCH_DEP_CFLAGS += -march=i586
+ARCH_DEP_CFLAGS = -march=i586
 
 ifeq ($(BUILD_CLASS),CROSS)
    VALID_BUILDS = Ioc
diff --git a/configure/os/CONFIG.Common.linux-686 b/configure/os/CONFIG.Common.linux-686
index d275d7e3c..f19bcb6c7 100644
--- a/configure/os/CONFIG.Common.linux-686
+++ b/configure/os/CONFIG.Common.linux-686
@@ -11,7 +11,7 @@
 include $(CONFIG)/os/CONFIG.Common.linux-x86
 
 # i686 is euivalent to pentiumpro
-ARCH_DEP_CFLAGS += -march=i686
+ARCH_DEP_CFLAGS = -march=i686
 
 ifeq ($(BUILD_CLASS),CROSS)
    VALID_BUILDS = Ioc