diff --git a/scripts/3_Configure_Source_Code.sh b/scripts/3_Configure_Source_Code.sh
index a0340d8..20cd611 100755
--- a/scripts/3_Configure_Source_Code.sh
+++ b/scripts/3_Configure_Source_Code.sh
@@ -88,7 +88,7 @@ mk_add_options MOZ_TELEMETRY_REPORTING=0
 # ac_add_options --enable-linker=gold
 END
 
-if [[ "$(/lib/libc.so 2>&1)" != *"musl libc"* ]]; then
+if [[ "$(/lib/libc.so 2>&1)" == *"musl libc"* ]]; then
 	echo "ac_add_options --disable-jemalloc" >> ${CI_PROJECT_DIR}/mozconfig
 	echo "ac_add_options --disable-gold" >> ${CI_PROJECT_DIR}/mozconfig
 fi