diff --git a/Makefile b/Makefile
index 197b55edf3eeeaec345d88227825cc550e6de72d..e22ba5c321dc47fdf512f30c5e6c741c41fb99eb 100644
--- a/Makefile
+++ b/Makefile
@@ -215,6 +215,7 @@ endif
 $(GITGUI_MAIN): git-gui.sh GIT-VERSION-FILE GIT-GUI-VARS
 	$(QUIET_GEN)rm -f $@ $@+ && \
 	sed -e '1s|#!.*/sh|#!$(SHELL_PATH_SQ)|' \
+		-e 's|@@SHELL_PATH@@|$(SHELL_PATH_SQ)|' \
 		-e '1,30s|^ argv0=$$0| argv0=$(GITGUI_SCRIPT)|' \
 		-e '1,30s|^ exec wish | exec '\''$(TCLTK_PATH_SED)'\'' |' \
 		-e 's/@@GITGUI_VERSION@@/$(GITGUI_VERSION)/g' \
diff --git a/git-gui.sh b/git-gui.sh
index 815725d1e1fec3068e07320a682becd80d25fff9..8ade423eb46006025e56ee68e49230a8e8efb579 100755
--- a/git-gui.sh
+++ b/git-gui.sh
@@ -128,6 +128,7 @@ set _githtmldir {}
 set _reponame {}
 set _iscygwin {}
 set _search_path {}
+set _shellpath {@@SHELL_PATH@@}
 
 set _trace [lsearch -exact $argv --trace]
 if {$_trace >= 0} {
@@ -137,6 +138,11 @@ if {$_trace >= 0} {
 	set _trace 0
 }
 
+proc shellpath {} {
+	global _shellpath
+	return $_shellpath
+}
+
 proc appname {} {
 	global _appname
 	return $_appname
diff --git a/lib/blame.tcl b/lib/blame.tcl
index 2137ec9684d0acdb386e6b50e1b41aa7705c9746..77656d3675c5c128eafe3667d5fcb95e38559b9f 100644
--- a/lib/blame.tcl
+++ b/lib/blame.tcl
@@ -460,7 +460,9 @@ method _load {jump} {
 	}
 	if {$commit eq {}} {
 		if {$do_textconv ne 0} {
-			set fd [open |[list $textconv $path] r]
+			# Run textconv with sh -c "..." to allow it to
+			# contain command + arguments.
+			set fd [open |[list [shellpath] -c "$textconv \"\$0\"" $path] r]
 		} else {
 			set fd [open $path r]
 		}