diff --git a/Makefile.pre.in b/Makefile.pre.in
index 94cfb74138a..0bece8717ef 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -2652,7 +2652,7 @@ inclinstall:
 		$(INSTALL) -d -m $(DIRMODE) $(DESTDIR)$(INCLUDEPY)/internal; \
 	else	true; \
 	fi
-	@if test "$(INSTALL_MIMALLOC)" == "yes"; then \
+	@if test "$(INSTALL_MIMALLOC)" = "yes"; then \
 		if test ! -d $(DESTDIR)$(INCLUDEPY)/internal/mimalloc/mimalloc; then \
 			echo "Creating directory $(DESTDIR)$(INCLUDEPY)/internal/mimalloc/mimalloc"; \
 			$(INSTALL) -d -m $(DIRMODE) $(DESTDIR)$(INCLUDEPY)/internal/mimalloc/mimalloc; \
@@ -2673,7 +2673,7 @@ inclinstall:
 		echo $(INSTALL_DATA) $$i $(INCLUDEPY)/internal; \
 		$(INSTALL_DATA) $$i $(DESTDIR)$(INCLUDEPY)/internal; \
 	done
-	@if test "$(INSTALL_MIMALLOC)" == "yes"; then \
+	@if test "$(INSTALL_MIMALLOC)" = "yes"; then \
 		echo $(INSTALL_DATA) $(srcdir)/Include/internal/mimalloc/mimalloc.h $(DESTDIR)$(INCLUDEPY)/internal/mimalloc/mimalloc.h; \
 		$(INSTALL_DATA) $(srcdir)/Include/internal/mimalloc/mimalloc.h $(DESTDIR)$(INCLUDEPY)/internal/mimalloc/mimalloc.h; \
 		for i in $(srcdir)/Include/internal/mimalloc/mimalloc/*.h; \
diff --git a/Misc/NEWS.d/next/Build/2024-07-08-01-11-54.gh-issue-121467.3qWRQj.rst b/Misc/NEWS.d/next/Build/2024-07-08-01-11-54.gh-issue-121467.3qWRQj.rst
new file mode 100644
index 00000000000..a2238475546
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2024-07-08-01-11-54.gh-issue-121467.3qWRQj.rst
@@ -0,0 +1 @@
+Fix a Makefile bug that prevented mimalloc header files from being installed.