diff --git a/src/core/fonts.js b/src/core/fonts.js
index 38ebbf18c..09fafec1c 100644
--- a/src/core/fonts.js
+++ b/src/core/fonts.js
@@ -1272,7 +1272,7 @@ var Font = (function FontClosure() {
       var name = this.name;
       var type = this.type;
       var subtype = this.subtype;
-      var fontName = name.replace(/[,_]/g, "-");
+      let fontName = name.replace(/[,_]/g, "-").replace(/\s/g, "");
       var stdFontMap = getStdFontMap(),
         nonStdFontMap = getNonStdFontMap();
       var isStandardFont =
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index 367ff3ae2..479ae2c6c 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -88,6 +88,7 @@
 !issue11242_reduced.pdf
 !issue11279.pdf
 !issue11362.pdf
+!issue11578_reduced.pdf
 !bad-PageLabels.pdf
 !decodeACSuccessive.pdf
 !filled-background.pdf
diff --git a/test/pdfs/issue11578_reduced.pdf b/test/pdfs/issue11578_reduced.pdf
new file mode 100644
index 000000000..176cbda9d
--- /dev/null
+++ b/test/pdfs/issue11578_reduced.pdf
@@ -0,0 +1,98 @@
+%PDF-1.7
+%âãÏÓ
+1 0 obj 
+<<
+/Kids [2 0 R]
+/Count 1
+/Type /Pages
+>>
+endobj 
+2 0 obj 
+<<
+/Parent 1 0 R
+/MediaBox [0 0 200 50]
+/Resources 
+<<
+/Font 
+<<
+/F5 3 0 R
+>>
+>>
+/Contents 4 0 R
+/Type /Page
+>>
+endobj 
+5 0 obj 
+<<
+/Pages 1 0 R
+/Type /Catalog
+>>
+endobj 
+3 0 obj 
+<<
+/BaseFont /Times#20New#20Roman
+/DescendantFonts [6 0 R]
+/Subtype /Type0
+/Encoding /Identity-H
+/Type /Font
+>>
+endobj 
+4 0 obj 
+<<
+/Length 63
+>>
+stream
+BT
+10 20 TD
+/F5 20 Tf
+<00390052004f00580050004800560003> Tj
+ET
+
+endstream 
+endobj 
+7 0 obj 
+<<
+/FontName /Times#20New#20Roman
+/StemV 0
+/Ascent 693
+/Flags 32
+/Descent -216
+/ItalicAngle 0
+/FontBBox [-568 -307 2046 1040]
+/Type /FontDescriptor
+/CapHeight 0
+>>
+endobj 
+6 0 obj 
+<<
+/BaseFont /Times#20New#20Roman
+/CIDSystemInfo 
+<<
+/Supplement 0
+/Ordering (Identity)
+/Registry (Adobe)
+>>
+/Subtype /CIDFontType2
+/FontDescriptor 7 0 R
+/W [3 [250] 36 [722.168] 39 [722.168] 48 [889.16] 51 [556.152] 55 [575.684] 57 [593.262] 68 [443.848] 70 [443.848] 71 [500] 72 [443.848] 76 [277.832] 79 [277.832] 80 [777.832] 81 [500] 82 [500] 83 [500] 85 [333.008] 86 [389.16] 87 [277.832] 88 [500] 89 [500] 92 [500]]
+/Type /Font
+>>
+endobj xref
+0 8
+0000000000 65535 f 
+0000000015 00000 n 
+0000000074 00000 n 
+0000000254 00000 n 
+0000000383 00000 n 
+0000000203 00000 n 
+0000000680 00000 n 
+0000000499 00000 n 
+trailer
+
+<<
+/Root 5 0 R
+/Size 8
+>>
+startxref
+1134
+%%EOF
diff --git a/test/test_manifest.json b/test/test_manifest.json
index 2674f4d70..acd3d3f15 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -3030,6 +3030,13 @@
        "lastPage": 1,
        "type": "eq"
     },
+    {  "id": "issue11578",
+       "file": "pdfs/issue11578_reduced.pdf",
+       "md5": "6cefb4bdfae2fa25e5585374735e321f",
+       "rounds": 1,
+       "link": false,
+       "type": "eq"
+    },
     {  "id": "issue4890",
        "file": "pdfs/issue4890.pdf",
        "md5": "1666feb4cd26318c2bdbea6a175dce87",