diff --git a/build.sh b/build.sh
index 486e0664..bb5bc25f 100755
--- a/build.sh
+++ b/build.sh
@@ -530,7 +530,8 @@ for nip in $NEEDED_NIPS; do
 done
 
 # Build flags
-CFLAGS="-Wall -Wextra -std=c99 -fPIC -O2"
+# Disable fortification for MUSL compatibility (prevents __*_chk symbol issues)
+CFLAGS="-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0 -Wall -Wextra -std=c99 -fPIC -O2"
 CFLAGS="$CFLAGS -DENABLE_FILE_LOGGING -DENABLE_WEBSOCKET_LOGGING -DENABLE_DEBUG_LOGGING"
 INCLUDES="-I. -Inostr_core -Inostr_core/crypto -Icjson -Inostr_websocket"