diff --git a/configure b/configure
index c195b24..ae4e20f 100755
--- a/configure
+++ b/configure
@@ -4837,7 +4837,7 @@
 
 gcc_version="$(gcc -dumpversion)"
 extra_cflags=""
-if [ "${gcc_version:0:1}" -gt 5 ]; then
+if [ "${gcc_version:0:1}" -gt 6 ]; then
    extra_cflags="-Wimplicit-fallthrough=2"
 fi
 
diff --git a/configure.in b/configure.in
index 2e522ba..b268a20 100644
--- a/configure.in
+++ b/configure.in
@@ -524,7 +524,7 @@
 
 gcc_version="$(gcc -dumpversion)"
 extra_cflags=""
-if [[ "${gcc_version:0:1}" -gt 5 ]]; then
+if [[ "${gcc_version:0:1}" -gt 6 ]]; then
    extra_cflags="-Wimplicit-fallthrough=2"
 fi